I use mauronofrio TWRP and have no issues.
https://forum.xda-developers.com/Mi-9/development/recovery-unofficial-twrp-xiaomi-mi-9-t3905825
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After flashing TWRP in fastboot disconnect the phone and reboot manualy to recovery. Don't use fastboot commands to reboot the device.
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I see, than I guess it's a hardware failure or something. Take it to a service center if you have one in your country.
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Strange. No such issues on my device after dirty flash.
My last clean flash was begining of january (as far as I remember), and dirty flashed most of the available weekly roms since than...
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Yeah I was reading above in this thread. Still strange as most of users get CTS false, but some get true... We shall see what happens...
If it's a bootloader detection thing, I guess we would all have false.
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SafetyNet CTS indeed fails on this Mi9 ROM.
Rooted device. I tried also SafetyPatch and MagiskHide Props Config but no improvement.
Previous versions were all OK.
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I guess that's the reason:
New - "Adjust wallpaper to Dark mode" option
Dissable and check the difference...
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Maybe you shoud flash fastboot stock ROM first as you are not on MIUI. Than TWRP, format data etc following the steps in OP...
But I'm not sure, just an idea.
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I sometimes uninstall Magisk and sometimes not. Last week I updated without uninstalling and all was fine... You have to re-flash Magisk after the update anyway.
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