My DSO4254C with serial number CN1841002002327 hangs on startup screen.
I tried recovery menu and F2 option, but device hangs on QR code screen.
F3 option with firmware "dso4kb_20211207.upk" (downloaded from Hantek website) fails with message "Operation failed!".
I use an 512Mb FAT32 USB drive.
Could you provide an recovery file for this device please.