Third, you can try using a serial port connection and burning the Fsk filesystem manually from the command prompt (you would have to get it on an SD card). Here is
some info you may find useful. More (in Russian)
here.[/QUOTE]
Thank You so much! I get today my PRS-500 back to live after bad trip with Universal Flasher
It was fun to search all those pages in archive.org and translating from russian
I've soldered 3 thin wires (RX,TX,GND) and stick out of "universal connector" (this strange multiple pin port in the middle of bottom PRS-500). I have old cellphone USB CA-50 cable and I was shocked when my dead PRS-500 started speak to me by OSX terminal
Thank You for Your work on this subject.