Octopus F446 stop working after flashing in RatOS configurator

I decided to replace my raspberry pi with another raspberry pi 4 and do configuration process all over again. I selected Octopus F446 as my mainboard and configurater said that there were difference in klipper version on me pi and mcu, so I kicked flash mcu. After that configurater stoped seeing my mcu. And auto-flash option became unavailable, so I first try DFU mode flashing, I was able to put my mcu into DFU mode bottom "Flash" became avaliable (I did remove pin from BOOT0 as instructed), but after that I got error in pic related. So after that I tried flashing using SD card, it didn't work, I didn't get firmware.cur file on SD card. I tried flashing through DFU by ssh and my after flashing my pi sees mcu in USB connection list, but after restart it disappears. Then I tried to flash bootloader, I did it, but same problems persisted. I am at the end of my wits, please help.