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adb shell rm /data/system/locksettings.db Haven't tried removing locksettings/gatekeeper files for years, but it used to be a valid method to remove screenlock if you knew the decryption password, but screenlock didn't accept it for whatever reason. Can also try renaming it should removing it...

If you already successfully flashed twrp, you could hold volume up during reboot or while pressing the power button, will boot into twrp.

Settings - my device - factory reset or just wipe - factory reset option in twrp, also wipe internal storage (don't wipe anything else), phone should boot from a clean slate.

You could reset its password since your email/phone number are associated with it or maybe a browser still is logged in with mi account, if the device is removed from your device list, it shouldn't ask for a password on first boot either.

Take the boot.img from the rom you want to update to and patch-flash that one.

Possible BMS (battery management system) damage when charged with a wet charging port? If that is the case, I would strongly suggest not charging the phone and replacing the battery. Charging it without a working BMS could turn it into a fireball if overcharged, the charger won't know when it's...

Usually no need to disable anything unless the module specifically asks for it (read their instructions), root will be removed after an update. What I've sometimes done is update, but not reboot, immediately re-root, then boot to system, so settings for modules aren't lost. Obviously this can...

How long does it hang for? After the installer wipes cache, it can take several minutes to get past the 3 dots, it will only do it once though.

If it has fastboot in the filename, it's a fastboot rom, you unzip it and run the bat file to update. If it doesn't, you move the zip file onto the phone and install it in TWRP, lots of instructions for both around this forum.

If doing a fastboot update, you just boot the phone in fastboot and run windows_fastboot_update_rom.bat on PC, it'll be updated with no data loss. If it's a recovery rom, just flash it in TWRP, don't wipe or format anything. Downgrading or going to weekly would require a format.

If you are absolutely certain the rom you're are installing is correct, you can flash the stock rom with miflash and use "clean all and lock", it will format the whole device, write stock partitions and lock the bootloader, twrp will be gone as well. If you remove the phone on your mi account...

Old battery? Does it last normally when above 20%?

Turn off AI? Will reduce postprocessing, xiaomi.eu doesn't modify stock apps unless needed for translations or debloating. If you wish to configure the camera the way you want it to work, give g cam a try: https://www.celsoazevedo.com/files/android/google-camera/

Also the filename said it's for 12X not 12, install the correct one using TWRP, plenty of instructions here.

Mi 9 doesn't have any kind of reverse charging, you definitely caused some hardware damage which may only be solvable with a new phone.

Orangefox is a fork of TWRP, it's essentially the same with some added features which may or may not be beneficial on some devices.

Since fastboot works, you can use miflash and flash back stock rom, then try again.

If you are using xiaomi.eu, just dirty flash the same rom version again (install in twrp / fastboot without wiping anything) and stock apps should be back without any data loss, if you're rooted, you need to do this again.

It's still a decent phone today, a friend bought one recently and I put xiaomi.eu on it, excellent camera for its second-hand price, performance is good, battery is so-so. Supposedly has a very high idle power usage when wifi is on which is a known issue with this device, on some batches the...

Seems overkill for a softbrick, if the phone can't even boot into recovery/fastboot, then EDL should be considered.