[Help] mi 9T boot loop after installing lineage os - Redmi K20 / Xiaomi Mi 9T Questions & Answers

I have unlocked my boot loader and tried installing Extrended Ui, but every time i flashed the rom with TWRP it showed a message saying "no os installed", when rebooting is got stuck in the mi logo, the rebooting in TWRP i installed Lineage, when rebooting the No Os warning didn't appear, so i think it worked but it never passed the lineage boot animation, i the tried installing the stock rom that its in the Havoc Os thread but like Lineage it gets stuck in the boot animation.
Any solution you might know?
I installed the frimeware every time before a rom installation

Download and flash this firmware first and then flash the ROM you want.
https://xiaomifirmwareupdater.com/vendor/davinci/
Just download the newest Global

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Your help will be admitted...
are you wiping the cash and also factory reset?

Problem with gapps

Hey, I was on the latest pixys when the mobile stopped responding. Twrp would get stuck at splash screen and the OS would be stuck at the lock screen.
Flashed rwrp via fastboot and recovery was still stuck at splash screen. Flashed stock rom via adb and the mobile was stuck in a boot loop.
Tried bl unlock again and I could use custom recoveries. Flashed flashable stock from there- bootloop again.
Finally, flashed Havoc without gapps and the mobile is functional. That's just it though. The moment I try flashing anything with gapps, there’s a bootloop(tried pixel experience and latest opengapps)

Is there any solution, or i have to go for service centre only?

Hlo sir, help me please
My device is not booting into system.
When i try to boot it, it shows unlocked bootloader warning, then ANDROID logo, then ASUS logo then, boot animation of the rom (which i have flashed, like miui, stock or any other) for 1-2 seconds and then got shutdown/power off.
I tried everything,
Flashed custom rom via twrp, flashed stock rom via fastboot, flashed stock rom via QFIL tool, flashed stock rom via termux from another device, flashed stock rom via AFT tool, flashed twrp flashable decrypted rom. Every ROM getting flashed successfully via every method mentioned above(Tried Stock Oreo and Pie, and Custom Q miui ROM)
But no success, device got shut down after 1-2 second of boot animation.
Device is booting in fastboot, twrp, stock recovery, but not into system.
I am able to lock bootloader, unlock bootloader, flash twrp successfully.
The problem starts, when i was on unofficial RR and i tried some substratum overlay. And then whenever tried to restart my device, it was showing RR boot animation for 1-2 seconds and then power off eveytime. But i don't know, what is the actual reason for starting this problem.
Please help me Sir, or i have to go to service center.
Sorry for bad English.
have you tried clean flashing it

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Hi, I have a moto g5 plus potter, it had twrp 3.3.0-0 installed with arrow os 11 for potter. The phone would randomly reboot like once a day and yesterday, while I was transferring filed using airdroid, the phone shut down. As of now, I cannot boot into arrow os or recovery. It's just stuck in a sort of bootloop. When I try to boot into aos it gets stuck in the "your device has been unlocked... reboot in 5 seconds" screen. I had Magisk v23 with Magisk manager installed too. When I try to boot to recovery, it gets stuck in the twrp logo screen that says "team win recovery project". I can boot into bootloader, I flashed twrp v3.5.2_9-0 and still it gets stuck trying to get into recovery.
Any help?

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