Downgrade problem SV-S550 from version 5.5.1.1 to 5.4.3.1

Products

• SSL Visibility Appliance Software
• SV-S550
• SSP-S210 PLATFORM
• SSP-S410 PLATFORM
• SSP
• SSP-S210
• SSP-S410

Issue/Introduction

Attempted to downgrade the SV-S550 from version 5.5.1.1 to 5.4.3.1.
However, the following messages were shown on the console, and the downgrade failed.

---------console log output--------------
+ cp /var/log/clp/upgrade_downgrade /core/upgrade-failure.2025XXXXXXXXXX
+ echo 'ERROR during system upgrade, booting previous system image'
ERROR during system upgrade, booting previous system image
+ sleep 5
---------console log output--------------

The downgrade process are accordingly from release note process that run factory default before the downgrade.
Please let me advice the downgrade process.

Environment

SV-S550
SSP-S410
SSP-S210

Resolution

Please try following the bootloader factory default process if you face downgrade issue from version 5.5.1.1 to 5.4.3.1.
[Note] The bootloader factory default process need console cable.

[Downgrade procedure]
1. Restart the system when the default image is set to 5.4.3.1 
2. Hit "space" when the bootloader menu  and a message "Press the space key to select an alternate system to boot." appears on a screen.
3. Enter "r" when prompted "System number (d for diagnostic menu):"
4. Enter "y" when Warning and "Continue with system re-initialization?" prompt appears.
5. Enter 5.4.3.1 image number when "System number (d for diagnostic menu):" prompt appears.

Additional Information

This downgrade process is also fixed if you experience the downgrade issue by Integrated Secure Gateway(ISG) software version from 2.5.1.1 to 2.4.10.1.

[Downgrade procedure for SSP device]
The bootloader factory default process need console cable.

1. Restart the system when the default image is set to 2.4.10.1 
2. Hit "space" when the bootloader menu  and a message "Press the space key to select an alternate system to boot." appears on a screen.
3. Enter "r" when prompted "System number (d for diagnostic menu):"
4. Enter "y" when Warning and "Continue with system re-initialization?" prompt appears.
5. Enter 2.4.10.1 image number when "System number (d for diagnostic menu):" prompt appears.