ASR9K Software Downgrade

[MaheshB0ddu]

Hi 

Trying to downgrade AS9K device version from 24.3.2 to 7.8.2 but it is aborting the process

Tried Reloading and Pressed ctrl+c but didn't take me to rommon or turboboot menu again loading to router mode,
Any suggestion


RP/0/RSP0/CPU0:ios#install add source disk0: ASR9K-x64-iosxr-px-k9-7.8.2.tar
Fri Sep 12 08:15:47.865 UTC
2025-09-12 08:15:50 Install operation 14 started by root:
install add source disk0: ASR9K-x64-iosxr-px-k9-7.8.2.tar
2025-09-12 08:15:59 Install operation 14 aborted
RP/0/RSP0/CPU0:Sep 12 08:15:59.401 UTC: sdr_instmgr[1221]: %INSTALL-INSTMGR-3-OPERATION_ABORT : Install operation 14 aborted
RP/0/RSP0/CPU0:ios#sh ver
Fri Sep 12 08:16:02.995 UTC
Cisco IOS XR Software, Version 24.3.2
Copyright (c) 2013-2024 by Cisco Systems, Inc.

Build Information:
Built By : swtools
Built On : Fri Dec 6 17:57:09 PST 2024
Built Host : iox-ucs-059
Workspace : /auto/srcarchive11/prod/24.3.2/asr9k-x64/ws
Version : 24.3.2
Location : /opt/cisco/XR/packages/
Label : 24.3.2

cisco ASR9K () processor
System uptime is 3 hours 22 minutes

RP/0/RSP0/CPU0:ios#show install active summary
Fri Sep 12 08:16:14.664 UTC
Label : 24.3.2

Active Packages: 1
asr9k-xr-24.3.2 version=24.3.2 [Boot image]

RP/0/RSP0/CPU0:ios#
RP/0/RSP0/CPU0:ios#install add source disk0: asr9k-mini-x64-7.8.2.iso ASR9K-x6$
Fri Sep 12 08:16:49.436 UTC
2025-09-12 08:16:51 Install operation 15 started by root:
install add source disk0: asr9k-mini-x64-7.8.2.iso ASR9K-x64-iosxr-px-k9-7.8.2.tar
2025-09-12 08:17:01 Install operation 15 aborted
RP/0/RSP0/CPU0:Sep 12 08:17:01.408 UTC: sdr_instmgr[1221]: %INSTALL-INSTMGR-3-OPERATION_ABORT : Install operation 15 aborted
RP/0/RSP0/CPU0:ios#show ins
insight install
RP/0/RSP0/CPU0:ios#show install re
repository request
RP/0/RSP0/CPU0:ios#show install log 14
Fri Sep 12 08:17:20.734 UTC
2025-09-12 08:15:50 Install operation 14 started by root:
install add source disk0: ASR9K-x64-iosxr-px-k9-7.8.2.tar
2025-09-12 08:15:51 Action 1: install add action started
2025-09-12 08:15:56 ERROR! Unknown file download protocol, please check download protocol and try again!
2025-09-12 08:15:56 ERROR!! failed during install add precheck

2025-09-12 08:15:59 Install operation 14 aborted
2025-09-12 08:15:59 Ending operation 14

RP/0/RSP0/CPU0:ios#show install log 15
Fri Sep 12 08:17:24.677 UTC
2025-09-12 08:16:51 Install operation 15 started by root:
install add source disk0: asr9k-mini-x64-7.8.2.iso ASR9K-x64-iosxr-px-k9-7.8.2.tar
2025-09-12 08:16:52 Action 1: install add action started
2025-09-12 08:16:57 ERROR! Unknown file download protocol, please check download protocol and try again!
2025-09-12 08:16:57 ERROR!! failed during install add precheck

2025-09-12 08:17:01 Install operation 15 aborted
2025-09-12 08:17:01 Ending operation 15

RP/0/RSP0/CPU0:ios#

[MaheshB0ddu]

Downgrade reason my organisation using this as a standard accross all devices.

[Torbjørn]

Your install add command is not correct. It needs to be the following: install add source file disk0:ASR9K-x64-iosxr-px-k9-7.8.2.tar

[MaheshB0ddu]

Yeah I see that, but that is changed acc to https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r7-7/system-setup/configuration/guide/b-system-setup-cg-asr9000-77x/perform-system-upgrade-and-install-feature-packages.html#Cisco_Reference.dita_c0bbfcab-e764-420a-886a-16906dd044d...

Space should be given there and that is valid, without space command not executing.

Thanks for the suggestion. I will try and let you know.

[MaheshB0ddu · Accepted solution]

Hi All,

The issue is resolved... 

We had the image files in disk0: due to that the system aborted the install action.

Those should be in harddisk: 

Thanks all for the support.

Thanks @Torbjørn 

Love this platform.

[Torbjørn]

No problem @MaheshB0ddu! Thanks for reporting back with the solution.