Old iPhone 8 Plus Jailbreak

Just found my old iPhone 8 Plus and I considering updating it to the latest supported iOS (I think it's 16.7.10?) and maybe jailbreaking it afterward..

Currently, the version installed on the device is 14.3 and it has some leftovers from an old unc0ver jailbreak from the past (I used Altstore to jailbreak that iOS version).

1) How can I remove the jailbreak leftovers from my device in order to update it? should I jailbreak again with Altstore & unc0ver and then do the Restore RootFS? There are more things I need to do before/after that?

2) It is possible to update the iOS to 16.6.1 and not to 16.7.10? (only because Dopamine is better)

3) Should I update the iOS from the iPhone or iTunes?

4) Should I enter DFU mode in order to update my iPhone?

Any other tips are welcome :)