F5 gtm upgrade from 11.4.1 to 11.5.3 in active/active mode with synchronization group

I have a f5 gtm active/active upgrade to do from 11.4.1 to 11.5.3 and I remember last time i did upgrade on 10.x i accidently wiped out wideip.conf.

Whats the best way to do this that this does not happen again? I know u need to uncheck synchronization in general properties . Anything else?