Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

computerli's avatar
computerli
Icon for Altostratus rankAltostratus
Apr 20, 2020

Downgrade F5 TMOS from 13.1.3 to 13.1.1

Hello Everyone: I recently upgrade TMOS from 11.5.3 to 13.1.3 on a blade 2100 Due to a bug identified by F5 support where blade 2100 causes issues with 13.1.3, the recommendation is to downgrade fr...
application delivery
LTM
TMOS
Beaker's avatar
Beaker
Icon for Cirrus rankCirrus
Apr 20, 2020

Do you still have 11.5.3 in a partition? You could go back to that then install 13.11 then boot into it from 11.5.3.