IT WORKS! my phone is alive again! thank you for help! I will make detailed tutorial asap so I won't forget anything.. anyway the problem was probably in driver. I used different pc (untouched by flashing stuff and android app development that I did in the past) and used drivers from this link https://xiaomiflashtool.com/download/xiaomi-flash-tool-20200314
EDIT: guide available here - hope it helps somebody https://xdaforums.com/t/guide-how-t...ight-turns-on-for-a-second-using-edl.4228641/
EDIT: guide available here - hope it helps somebody https://xdaforums.com/t/guide-how-t...ight-turns-on-for-a-second-using-edl.4228641/
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