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I'm having a problem. After I replaced the files in the font folder and exited recovery mode, I get the blue screen of death. I've tried putting the old files back in and resetting default settings, but it keeps appearing. I need help, I use 3.71 m33 by the way.
My suggestion would be to re-flash the FW - I think that 3.71 Particulary suffered from a little present sony designed in that it enters this constant cycle of the BSOD. I cannot remember they exact reason why now, it was some time ago.
You will probably have to re-partion Lflash and then re-install the FW.
Also google 'Sony Bomb' if you want the exact reason why this happens.