cannot upgrade android version to android 9 - MIUI Central

hi all
my Xiaomi phone (SDM 845) was flashed custom Oxygen os and bricked my phone.
Now i cannot install miui stock firmware android 9 and 10 .
Everytime i install fastboot firmware android 9 , android 10,
get stuck into Bootloader.I tried <Wipe /format > in recovery ,but did not boot to system.
always loop into fastboot mode.
Only android 8.1 rom boot to system successfully.
I cannot upgrade to pie and Q rom.
help me .

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phone got bricked

I unlocked the bootloader. Then installed twrp and custom rom. Then rom boot us successfully.
Then i restarted the phone and it stuck in bootloop.
I was on android 10 firmware on custom rom.
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I tried Mod Installer APK inside of Malay but it shows Error 1 and does nothing.
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(Translated with Google from French)
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Therefore, if your phone can boot into Odin mode (downloading mode), you need to flash your phone with your stock ROM android 11 with binary 5 (!).
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Please HELP ANYONE.
I DON'T KNOW WHAT TO DO

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