
I'm trying to install picuntu, but it fails in the very beginning. Now device don't boot.
I connect OTG to PC (with or without pressing key near mic). RKBatchTool.exe draw BLUE box. Not green. Update and Restore doesn't work:

Finless ROM 1.37 write "Found RKAndroid MaskRom Rock Usb". Erase NAND doesn't work:

And "Flash ROM" doesn't work too:

Tried different PCs, different USB cables. How to unbrick it?
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