The only thing that'll be disabled by the FW update is KFMon, which means that you won't be able to *launch* KOReader without reinstalling that (either standalone, or via the OCP. Note that the OCP install script can handle KFMon's standalone package just fine, if you want to save a bit of time).
Everything else is completely orthogonal to the official FW, and is perfectly safe as long as you don't factory reset.
(NickelMenu will survive the update, so, another approach is to tweak the NM configs installed by the OCP to bypass KFMon and go directly through NM. That's already in there almost ready to use, everything's just commented out).
Last edited by NiLuJe; 11-11-2020 at 07:04 PM.
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