End-of-Sale and End-of-Life Announcement for the Cisco ISR4200, ISR4300 and select ISR4400 Series Platform

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Updated:October 8, 2024

Bias-Free Language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

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Updated:October 8, 2024

Table of Contents

 

 

Overview

EOL14896 - Amended

Cisco announces the end-of-sale and end-of-life dates for the Cisco ISR4200, ISR4300 and select ISR4400 Series Platform. The last day to order the affected product(s) is November 7, 2023. Customers with active service contracts will continue to receive support from the Cisco Technical Assistance Center (TAC) as shown in Table 1 of the EoL bulletin. Table 1 describes the end-of-life milestones, definitions, and dates for the affected product(s). Table 2 lists the product part numbers affected by this announcement. For customers with active and paid service and support contracts, support will be available under the terms and conditions of customers' service contract.

End-of-life milestones

Table 1.      End-of-life milestones and dates for the Cisco ISR4200, ISR4300 and select ISR4400 Series Platform

Milestone

Definition

Date

End-of-Life Announcement Date

The date the document that announces the end of sale and end of life of a product is distributed to the general public.

November 7, 2022

End-of-Sale Date:
HW,License

The last date to order the product through Cisco point-of-sale mechanisms. The product is no longer for sale after this date.

November 7, 2023

Last Ship Date:
HW,License

The last-possible ship date that can be requested of Cisco and/or its contract manufacturers. Actual ship date is dependent on lead time.

February 6, 2024

End of SW Maintenance Releases Date:
HW

The last date that Cisco Engineering may release any final software maintenance releases or bug fixes. After this date, Cisco Engineering will no longer develop, repair, maintain, or test the product software.

August 31, 2025

End of Vulnerability/Security Support:
HW

The last date that Cisco Engineering may release a planned maintenance release or scheduled software remedy for a security vulnerability issue.

November 30, 2028

End of Routine Failure Analysis Date:
HW

The last-possible date a routine failure analysis may be performed to determine the cause of hardware product failure or defect.

November 6, 2024

End of New Service Attachment Date:
HW

For equipment and software that is not covered by a service-and-support contract, this is the last date to order a new service-and-support contract or add the equipment and/or software to an existing service-and-support contract.

November 6, 2024

End of Service Contract Renewal Date:
HW

The last date to extend or renew a service contract for the product.

February 5, 2028

Last Date of Support:
HW

The last date to receive applicable service and support for the product as entitled by active service contracts or by warranty terms and conditions. After this date, all support services for the product are unavailable, and the product becomes obsolete.

November 30, 2028

HW = Hardware          OS SW = Operating System Software        App. SW = Application Software

Note:      The last supported IOS-XE Release trains will be the 17.9.x and 17.12.x for the listed ISR 4000 Platforms. IOS-XE Release trains 17.10.x and 17.11.x will not be supported. For SD-WAN deployments, future vManage Releases 20.12, 20.15 and 20.18 will support IOS-XE Release train 17.12.x

Product part numbers

Table 2.      Product part numbers affected by this announcement

End-of-Sale Product Part Number

Product Description

Replacement Product Part Number

Replacement Product Description

Additional Information

ISR4221-SEC/K9

Cisco ISR 4221 SEC Bundle with SEC lic

C8200L-1N-4T

Cisco Catalyst 8200L with 1-NIM slot and 4x1G WAN ports

-

ISR4221/K9

Cisco ISR 4221 (2GE,2NIM,8G FLASH,4G DRAM, IPB)

C8200L-1N-4T

Cisco Catalyst 8200L with 1-NIM slot and 4x1G WAN ports

-

ISR4221X/K9

Cisco ISR 4221 (2GE,2NIM,8G FLASH,8G DRAM, IPB)

C8200L-1N-4T

Cisco Catalyst 8200L with 1-NIM slot and 4x1G WAN ports

-

ISR4321-AX/K9

Cisco ISR 4321 AX Bundle w/APP, SEC lic

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4321-AXV/K9

Cisco ISR 4321 AXV Bundle, w/APP, SEC, UC License

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4321-DNA

Cisco ISR 4321 (2GE,2NIM,4G FLASH,4G DRAM, IPB) with DNA sub

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4321-PM20

Cisco ISR4321 Promitional Bundle

There is currently no replacement product available for this product.

-

-

ISR4321-SEC/K9

Cisco ISR 4321 Sec bundle w/SEC license

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4321-V/K9

Cisco ISR 4321 Bundle, w/UC License

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4321-VSEC/K9

Cisco ISR 4321 Bundle w/UC & SEC License

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4321/K9

Cisco ISR 4321 (2GE,2NIM,4G FLASH,4G DRAM, IPB)

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4331-AX/K9

Cisco ISR 4331 AX Bundle w/ APP, SEC lic

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4331-AXV/K9

Cisco ISR 4331 AXV Bundle, PVDM4-32 w/APP, SEC, UC License

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4331-DC/K9

Cisco ISR 4331 (3GE,2NIM,1SM,4G FLASH,4G DRAM, IPB) w/ DC PS

There is currently no replacement product available for this product.

-

-

ISR4331-DNA

Cisco ISR 4331 (3 GE, 2 NIM, 1 SM) with DNA Support

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4331-PM20

Cisco ISR4331 Promotional Bundle

There is currently no replacement product available for this product.

-

-

ISR4331-SEC/K9

Cisco ISR 4331 Sec bundle w/SEC license

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4331-V/K9

Cisco ISR 4331 UC Bundle, PVDM4-32, UC License

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4331-VSEC/K9

Cisco ISR 4331 Bundle w/UC & Sec Lic, PVDM4-32

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4331/K9

Cisco ISR 4331 (3GE,2NIM,1SM,4G FLASH,4G DRAM, IPB)

C8200-1N-4T

Cisco Catalyst C8200-1N-4T Router

-

ISR4351-AX/K9

Cisco ISR 4351 AX Bundle w/ APP, SEC lic

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4351-AXV/K9

Cisco ISR 4351 AXV Bundle, PVDM4-64 w/APP, SEC, UC License

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4351-DNA

Cisco ISR 4351 (3GE,3NIM,2SM,4G FLASH,4G DRAM, IPB) with DNA

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4351-PM20

Cisco ISR4351 Promotional Bundle

There is currently no replacement product available for this product.

-

-

ISR4351-SEC/K9

Cisco ISR 4351 Sec bundle w/SEC license

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4351-V/K9

Cisco ISR 4351 UC Bundle, PVDM4-64, UC License

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4351-VSEC/K9

Cisco ISR 4351 Bundle with UC & Sec Lic, PVDM4-64

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4351/K9

Cisco ISR 4351 (3GE,3NIM,2SM,4G FLASH,4G DRAM, IPB)

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4431-AX/K9

Cisco ISR 4431 AX Bundle with APP and SEC license

C8300-1N1S-4T2X

Cisco Catalyst C8300-1N1S-4T2X Router

-

ISR4431-AX/K9

Cisco ISR 4431 AX Bundle with APP and SEC license

C8300-1N1S-6T

Cisco Catalyst C8300-1N1S-6T Router

-

ISR4431-AXV/K9

Cisco ISR 4431 AXV Bundle, PVDM4-64 w/APP, SEC, UC Lic

C8300-1N1S-4T2X

Cisco Catalyst C8300-1N1S-4T2X Router

-

ISR4431-AXV/K9

Cisco ISR 4431 AXV Bundle, PVDM4-64 w/APP, SEC, UC Lic

C8300-1N1S-6T

Cisco Catalyst C8300-1N1S-6T Router

-

ISR4431-DNA

Cisco ISR 4431 (4GE,3NIM,8G FLASH,4G DRAM, IPB) with DNA sub

C8300-1N1S-4T2X

Cisco Catalyst C8300-1N1S-4T2X Router

-

ISR4431-DNA

Cisco ISR 4431 (4GE,3NIM,8G FLASH,4G DRAM, IPB) with DNA sub

C8300-1N1S-6T

Cisco Catalyst C8300-1N1S-6T Router

-

ISR4431-PM20

Cisco ISR4431 Promotional Bundle

There is currently no replacement product available for this product.

-

-

ISR4431-SEC/K9

Cisco ISR 4431 Sec bundle w/SEC license

C8300-1N1S-4T2X

Cisco Catalyst C8300-1N1S-4T2X Router

-

ISR4431-SEC/K9

Cisco ISR 4431 Sec bundle w/SEC license

C8300-1N1S-6T

Cisco Catalyst C8300-1N1S-6T Router

-

ISR4431-V/K9

Cisco ISR 4431 UC Bundle, PVDM4-64, UC License

C8300-1N1S-4T2X

Cisco Catalyst C8300-1N1S-4T2X Router

-

ISR4431-V/K9

Cisco ISR 4431 UC Bundle, PVDM4-64, UC License

C8300-1N1S-6T

Cisco Catalyst C8300-1N1S-6T Router

-

ISR4431-VSEC/K9

Cisco ISR 4431 Bundle with UC & Sec Lic, PVDM4-64

C8300-1N1S-4T2X

Cisco Catalyst C8300-1N1S-4T2X Router

-

ISR4431-VSEC/K9

Cisco ISR 4431 Bundle with UC & Sec Lic, PVDM4-64

C8300-1N1S-6T

Cisco Catalyst C8300-1N1S-6T Router

-

ISR4431/K9

Cisco ISR 4431 (4GE,3NIM,8G FLASH,4G DRAM, IPB)

C8300-1N1S-4T2X

Cisco Catalyst C8300-1N1S-4T2X Router

-

ISR4431/K9

Cisco ISR 4431 (4GE,3NIM,8G FLASH,4G DRAM, IPB)

C8300-1N1S-6T

Cisco Catalyst C8300-1N1S-6T Router

-

ISR4451-DNA

Cisco ISR 4451 (4 GE, 3 NIM, 2 SM) with DNA Support

C8300-2N2S-4T2X

Cisco Catalyst C8300-2N2S-4T2X Router

-

ISR4451-DNA

Cisco ISR 4451 (4 GE, 3 NIM, 2 SM) with DNA Support

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4451-PM20

Cisco ISR4451 Promotional Bundle

There is currently no replacement product available for this product.

-

-

ISR4451-X-AX/K9

Cisco ISR 4451 AX Bundle with APP and SEC license

C8300-2N2S-4T2X

Cisco Catalyst C8300-2N2S-4T2X Router

-

ISR4451-X-AX/K9

Cisco ISR 4451 AX Bundle with APP and SEC license

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4451-X-AXV/K9

Cisco ISR 4451 AXV Bundle, PVDM4-64 w/APP, SEC, UC lic

C8300-2N2S-4T2X

Cisco Catalyst C8300-2N2S-4T2X Router

-

ISR4451-X-AXV/K9

Cisco ISR 4451 AXV Bundle, PVDM4-64 w/APP, SEC, UC lic

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4451-X-SEC/K9

Cisco ISR 4451 Sec Bundle, w/SEC license

C8300-2N2S-4T2X

Cisco Catalyst C8300-2N2S-4T2X Router

-

ISR4451-X-SEC/K9

Cisco ISR 4451 Sec Bundle, w/SEC license

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4451-X-V/K9

Cisco ISR 4451 UC Bundle, PVDM4-64, UC Lic

C8300-2N2S-4T2X

Cisco Catalyst C8300-2N2S-4T2X Router

-

ISR4451-X-V/K9

Cisco ISR 4451 UC Bundle, PVDM4-64, UC Lic

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4451-X-VSEC/K9

Cisco ISR 4451 VSEC Bundle, PVDM4-64 w/ UC, SEC Lic

C8300-2N2S-4T2X

Cisco Catalyst C8300-2N2S-4T2X Router

-

ISR4451-X-VSEC/K9

Cisco ISR 4451 VSEC Bundle, PVDM4-64 w/ UC, SEC Lic

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

ISR4451-X/K9

Cisco ISR 4451 (4GE,3NIM,2SM,8G FLASH,4G DRAM)

C8300-2N2S-4T2X

Cisco Catalyst C8300-2N2S-4T2X Router

-

ISR4451-X/K9

Cisco ISR 4451 (4GE,3NIM,2SM,8G FLASH,4G DRAM)

C8300-2N2S-6T

Cisco Catalyst C8300-2N2S-6T Router

-

MEM-4300-4GU16G

4G to 16G DRAM Upgrade (8G+8G) for Cisco ISR 4330, 4350

There is currently no replacement product available for this product.

-

-

MEM-4300-4GU16G=

4G to 16G DRAM Upgrade (8G+8G) for Cisco ISR 4330, 4350

There is currently no replacement product available for this product.

-

-

MEM-4300-4GU8G

4G to 8G DRAM Upgrade (4G+4G) for Cisco ISR 4330,4350

There is currently no replacement product available for this product.

-

-

MEM-4320-4GU8G

4G to 8G DRAM Upgrade (Fixed 4G + additional 4G) for ISR4320

There is currently no replacement product available for this product.

-

-

MEM-4400-4GU16G

4G to 16G DRAM Upgrade (8G+8G) for Cisco ISR 4400

There is currently no replacement product available for this product.

-

-

MEM-4400-4GU8G

4G to 8G DRAM Upgrade (4G+4G) for Cisco ISR 4400

There is currently no replacement product available for this product.

-

-

MEM-FLASH-8U16G

8G to 16G Compact Flash Memory Upgrade for Cisco ISR 4450

There is currently no replacement product available for this product.

-

-

MEM-FLASH-8U32G

8G to 32G Compact Flash Memory Upgrade for Cisco ISR 4450

There is currently no replacement product available for this product.

-

-

MEM-FLSH-4U16G

4G to 16G eUSB Flash Memory Upgrade for Cisco ISR 4350, 4330

There is currently no replacement product available for this product.

-

-

MEM-FLSH-4U8G

4G to 8G eUSB Flash Memory Upgrade for Cisco ISR 4300

There is currently no replacement product available for this product.

-

-

MEM-FLSH-8U16G

8G to 16G eUSB Flash Memory Upgrade for Cisco ISR 4430

There is currently no replacement product available for this product.

-

-

MEM-FLSH-8U32G

8G to 32G eUSB Flash Memory Upgrade for Cisco ISR 4430

There is currently no replacement product available for this product.

-

-

PWR-4220-AC

AC Power Supply for Cisco ISR 4220

There is currently no replacement product available for this product.

-

-

PWR-4320-POE-AC

AC Power Supply with POE for Cisco ISR 4320

There is currently no replacement product available for this product.

-

-

PWR-4330-AC

AC Power Supply for Cisco ISR 4330

There is currently no replacement product available for this product.

-

-

PWR-4330-POE-AC

AC Power Supply with POE for Cisco ISR 4330

There is currently no replacement product available for this product.

-

-

PWR-4430-AC

AC Power Supply for Cisco ISR 4430

There is currently no replacement product available for this product.

-

-

PWR-4430-AC/2

AC Power Supply (Secondary PS) for Cisco ISR 4430

There is currently no replacement product available for this product.

-

-

PWR-4430-DC

DC Power Supply for Cisco ISR 4430

There is currently no replacement product available for this product.

-

-

PWR-4430-DC/2

DC Power Supply (Secondary PS) for Cisco ISR 4430

There is currently no replacement product available for this product.

-

-

PWR-4430-POE-AC

AC Power Supply with POE for Cisco ISR 4430

There is currently no replacement product available for this product.

-

-

PWR-4430-POE-AC/2

500W AC Power Supply (Secondary PS) for Cisco ISR 4430

There is currently no replacement product available for this product.

-

-

PWR-4450-AC

AC Power Supply for Cisco ISR 4450 and ISR4350

There is currently no replacement product available for this product.

-

-

PWR-4450-AC/2

AC Power Supply (Secondary PS) for Cisco ISR 4450

There is currently no replacement product available for this product.

-

-

PWR-4450-DC

DC Power Supply for Cisco ISR 4450 and 4350

There is currently no replacement product available for this product.

-

-

PWR-4450-DC/2

DC Power Supply (Secondary PS) for Cisco ISR 4451 and 4351

There is currently no replacement product available for this product.

-

-

PWR-4450-POE-AC

1000W AC PS w/ POE Module for Cisco ISR4450 and ISR4350

There is currently no replacement product available for this product.

-

-

PWR-4450-POE-AC/2

1000W AC PS (Secondary PS) w/ POE Module for Cisco ISR4450

There is currently no replacement product available for this product.

-

-

PWR-GE-POE-4400

POE Module for On Board GE for Cisco ISR 4400 & 4350

There is currently no replacement product available for this product.

-

-

FL-4220-BOOST-K9

Booster Performance License for 4220 Series

There is currently no replacement product available for this product.

-

-

FL-4220-PERF-K9

Performance on Demand License for 4220 Series

There is currently no replacement product available for this product.

-

-

FL-4320-BOOST-K9

Booster Performance License for 4320 Series

There is currently no replacement product available for this product.

-

-

FL-4320-HSEC-K9

U.S. Export Restriction Compliance license for 4320 series

There is currently no replacement product available for this product.

-

-

FL-4320-PERF-K9

Performance on Demand License for 4320 Series

There is currently no replacement product available for this product.

-

-

FL-4330-BOOST-K9

Booster Performance License for 4330 Series

There is currently no replacement product available for this product.

-

-

FL-4330-HSEC-K9

U.S. Export Restriction Compliance license for 4330 series

There is currently no replacement product available for this product.

-

-

FL-4330-PERF-K9

Performance on Demand License for 4330 Series

There is currently no replacement product available for this product.

-

-

FL-4350-BOOST-K9

Booster Performance License for 4350 Series

There is currently no replacement product available for this product.

-

-

FL-4350-HSEC-K9

U.S. Export Restriction Compliance license for 4350 series

There is currently no replacement product available for this product.

-

-

FL-4350-PERF-K9

Performance on Demand License for 4350 Series

There is currently no replacement product available for this product.

-

-

FL-44-BOOST-K9

Booster Performance License for 4450 Series

There is currently no replacement product available for this product.

-

-

FL-44-PERF-K9

Performance on Demand License for 4400 Series

There is currently no replacement product available for this product.

-

-

FL-4430-BOOST-K9

Booster Performance License for 4430 Series

There is currently no replacement product available for this product.

-

-

SL-4220-APP-K9

AppX License for Cisco ISR 4220 Series

There is currently no replacement product available for this product.

-

-

SL-4220-SEC-K9

Security License for Cisco ISR 4220 Series

There is currently no replacement product available for this product.

-

-

SL-4220-SECNPE-K9

SEC No Payload Encryption License for Cisco ISR 4220 Series

There is currently no replacement product available for this product.

-

-

SL-4320-APP-K9

AppX License for Cisco ISR 4320 Series

There is currently no replacement product available for this product.

-

-

SL-4320-SEC-K9

Security License for Cisco ISR 4320 Series

There is currently no replacement product available for this product.

-

-

SL-4320-SECNPE-K9

SEC No Payload Encryption License for Cisco ISR 4320 Series

There is currently no replacement product available for this product.

-

-

SL-4320-UC-K9

Unified Communication License for Cisco ISR 4320 Series

There is currently no replacement product available for this product.

-

-

SL-4330-APP-K9

AppX License for Cisco ISR 4330 Series

There is currently no replacement product available for this product.

-

-

SL-4330-SEC-K9

Security License for Cisco ISR 4330 Series

There is currently no replacement product available for this product.

-

-

SL-4330-SECNPE-K9

SEC No Payload Encryption License for Cisco ISR 4330 Series

There is currently no replacement product available for this product.

-

-

SL-4330-UC-K9

Unified Communication License for Cisco ISR 4330 Series

There is currently no replacement product available for this product.

-

-

SL-4350-APP-K9

AppX License for Cisco ISR 4350 Series

There is currently no replacement product available for this product.

-

-

SL-4350-SEC-K9

Security License for Cisco ISR 4350 Series

There is currently no replacement product available for this product.

-

-

SL-4350-SECNPE-K9

SEC No Payload Encryption License for Cisco ISR 4350 Series

There is currently no replacement product available for this product.

-

-

SL-4350-UC-K9

Unified Communication License for Cisco ISR 4350 Series

There is currently no replacement product available for this product.

-

-

SL-44-APP-K9

AppX License for Cisco ISR 4400 Series

There is currently no replacement product available for this product.

-

-

SL-44-SEC-K9

Security License for Cisco ISR 4400 Series

There is currently no replacement product available for this product.

-

-

SL-44-SECNPE-K9

SEC No Payload Encryption License for Cisco ISR 4400 Series

There is currently no replacement product available for this product.

-

-

SL-44-UC-K9

Unified Communication License for Cisco ISR 4400 Series

There is currently no replacement product available for this product.

-

-

Product migration options

Customers may be able to use the Cisco Technology Migration Program (TMP) where applicable to trade-in eligible products and receive credit toward the purchase of new Cisco equipment. For more information about Cisco TMP, customers should work with their Cisco Partner or Cisco account team. Cisco Partners can find additional TMP information on Partner Central at https://www.cisco.com/web/partners/incentives_and_promotions/tmp.html.

Customers may be able to continue to purchase the Cisco ISR4200, ISR4300 and select ISR4400 Series Platform through the Cisco Certified Refurbished Equipment program. Refurbished units may be available in limited supply for sale in certain countries on a first-come, first-served basis until the Last Date of Support has been reached. For information about the Cisco Certified Refurbished Equipment program, go to: https://www.cisco.com/go/eos.

The Cisco Takeback and Recycle program helps businesses properly dispose of surplus products that have reached their end of useful life. The program is open to all business users of Cisco equipment and its associated brands and subsidiaries. For more information, go to: https://www.cisco.com/web/about/ac227/ac228/ac231/about_cisco_takeback_recycling.html.

For more information

For more information about the Cisco End-of-Life Policy, go to: https://www.cisco.com/c/en/us/products/eos-eol-policy.html.

For more information about the Cisco Product Warranties, go to: https://www.cisco.com/c/en/us/products/warranty-listing.html.

To subscribe to receive end-of-life/end-of-sale information, go to: https://cway.cisco.com/mynotifications.

Any authorized translation issued by Cisco Systems or affiliates of this end-of-life Product Bulletin is intended to help customers understand the content described in the English version. This translation is the result of a commercially reasonable effort; however, if there are discrepancies between the English version and the translated document, please refer to the English version, which is considered authoritative.

 

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