ufff...
I managed to un-brick my prs-600. I am not sure but I believe that in my case the problem was with switching between Mac an PC constantly while trying to un-brick it.
Then I decided to stick with my PC, I tried different USB cables, and finally the PC managed to recognise the reader after the '10x reset' method - in fact, you have to press the reset button more that 10 times.
In my case the reader wasn't connected to the PC while reseting. Only when I got the 'Opening Book' screen I immediately connected it to the PC.
I had to use the original flasher from Sony's website and then used the 'russification' one, followed the instructions how to do it from this thread and all went OK.
On the positive side - the reader is much faster now? before I flashed it it was considerably slower.
I hope this helps someone.
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