I was 99,9% sure that it's gonna work ..
Can you tell me your device , it's mi 10 ??
If it's mi 10 , download the below twrp img ..
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This is the latest known , i use this twrp 0623 also ..
Remember do not flash it just boot ...
fastboot boot UMI.img
And tell me what exactly did you try to do ..
You were with developer weekly rom or with previous stable rom ??
After all did you try to reboot to system by twrp and what's happened ??
Did you try to go to wipe and swipe to factory reset in twrp and then reboot to system ??
Try those things and tell me also what did you do and the contition of the device ??
You're gonna need format data but first of all we should try to boot the device to save what we want or what we can ..