phone bricked

hi all, I recently tried to update my Mi 11 to 13.0.9 with the TWRP (twrp-3.6.2_12-v3.9_A12-venus-skkk.img) that was in one of the bigger threads on this website (sorry, i can't find it anymore but it had a link to androidfilehost with all xiaomi devices). After trying to flash the update, I had...

Hallo, for half a year i bough the mi max 3 and now it dont starts anymore the mi logo show up and and it crashed i remeber the last what it shows was "miui cant install". I was allready in an phone repair shop but they cant help me they mean somethink is with the motherboard. I had try myself...