Comment by weeha

Looks like they rotated all signings keys a day earlier:

https://my.f5.com/manage/s/article/K000157005

In October 2025, F5 rotated its signing certificates and keys used to cryptographically sign F5-produced digital objects.

As a result:

    BIG-IP and BIG-IQ TMOS product versions released in October 2025 and later are signed with new certificates and keys
    BIG-IP and BIG-IQ TMOS product versions released in October 2025 and later contain new public keys used to verify certain F5-produced objects released in October 2025 and later
    BIG-IP and BIG-IQ TMOS product versions released in October 2025 and later may not be able to verify certain F5-produced objects released prior to October 2025
    BIG-IP and BIG-IQ TMOS product versions released prior to October 2025 may not be able to verify certain F5-produced objects released in October 2025 and later