Hello, I have the exactly same problem with another Pocketbook reader (PB631 Touch HD).
The display is frozen, after powering on the LEDs next to the button blinks shortly and that's all.
It must be a HW problem, not SW as I even received a testing image from Pocketbook that should just show SN of the device after booting, but it does not boot.
Also, there are no signals on the UART port.
I checked that all buttons work correctly with the multimeter.
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