(adsbygoogle = window.adsbygoogle || []).push({}); What will happen if i update my cfw to the same firmware it's already on.

nothing but dont update from dex to cex or update from cex to dex as long as the fw is the same u should be fine

As pro said as long as you update to the same CEX or DEX firmware you're on nothing will happen but don't just install a CEX overtop of a DEX and vise versa or you will encounter issues.