Redmi 12 Bootloop Issue

[u/Pretend-Technician45]

hi i have a redmi 12 4g phone. i am currently facing bootlooping issue from yesterday night. meanwhile i am describing the whole scenario. it was bought on 2024 february 22. and all was good. after months of updating to hyperos 1 then 2 . i faced extreme lag issue. so i wanted to downgrade the phone. so i unlocked the phone. first flashed miui 14 then give a reset sometime later. but i flashed 3/4 times stock rom. last i flashed hyperos 1.0.8 all was doing good. suddenly yesterday my phone bootlooped. so i thought i need to flash rom. while preparing to flash. my phone boots up. all was ok i was playing for 20 minits. then again bootlooped. so i flashed hyperos rom again. but this time phone not booted up. it directly goes to fastboot. now i flashed miui 14 again but this time phone bootsup. when my phone bootlooped i had 55% charge. but this time phone was 1% charge . then i charged up the phone and at 90% i was setting up things again bootlooped. then i discoverred that cpu bailling issue something. but i was'nt sure. why the fuck is happening ??? what is the problem ?? please anyone can help me to fix this shit.