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It's in no order, play whichever one you want first

Backup the saves, uninstall the game and install the new apk

Yes

The password isn't in the trinity quests, try to remember any passwords mentioned in the main storyline 

Replay the trinity scenes and make sure to write down stuff that seems important. Good luck!

If you upgrade to Android 11, that happens, don't know why though

This game is not for you then. The way the story progresses already shows that it won't be a regular dating sim, if that's what you're interested in. Personally, I love the way the author is telling the story and I wouldn't have it any other way.

The answer is in the third trinity scene.