cisco ASR 9001 downgrade from 4.3.4 to 4.2.1

[talos]

if someone can provide the bridge image to me for downgrade to version 4.2.1

Downgrade Steps to Cisco IOS Software Release 4.2.1

1. TURBOBOOT the router with the P4040 Revision 3 bridge image.
2. Install add the Release 4.2.1 XR image (asr9k-mini-p.pie).
3. Install add the Release 4.2.1 P4040 Rev C SMU (asr9k-p-4.2.1.CSCue24148.pie).
4. Install add the asr9k-p-4.2.1.CSCuc53499.pie SMU, since this is a prerequisite for the P4040 Revision 3 SMU.
5. Install add the asr9k-p-4.2.1.CSCub42561.pie SMU, since this is a prerequisite for the P4040 Revision 3 SMU.
6. Install add all the necessary pies (for example: asr9k-mpls-p.pie).
7. Install activate all the above pies synchronously.

[balaji.bandi]

what is the reason for the downgrade ? - Lower version cisco may not support and have bugs.

its bit disruptive downgrade path and need more downtime.

[talos]

hi,

BB,thanks for your reply.

The customer requires all router versions to be consistent, and currently there is only one version that is inconsistent

[balaji.bandi]

i would suggest to upgradew to latest code rather downgrade, tell customer about the risk and support.