Yes, the scope is still locked up (boots up, but at the end of sequence there the relays do not switch, no waveforms, the keybord is unresponsive, and the all keys are lit). But I used only unified version the Platform Tools (are there some tools missing?) for restoring and failed. I emailed Hantec for version working with GD5F1GQ5UEYIG, still waiting. Btw. are the previous versions of PT still somewhere available?
It may not be apparent, but the serial number is on the bar code sticker on the back of the scope.
It seems, that the command "DDS:CAL:RESUlt" from SCPI codes list extracted by David gives back calibration data, in my case: 0.833235, 5.294509 (offset, amplitude). Is this correct?
Tomorrow morning I'll try to restore with dsoflash v.36 once more.
edit: the command should be "DDS:CAL:RESUlt?"