To enable PSN and spoof to v4.20, run the enabler, the screen will go black for about 15 secs, PS3 will then restart, your pad will have disconnected too so press the PS button. You can now check your firmware version in system info, it should say 'version 4.20' and you should now be able to connect to PSN. To disable and return to v3.55, just run the disabler, screen goes black again and PS3 restarts.
I can't see this lasting long, as it looks like Sony are currently only checking the firmware version above and beyond what Rebug have already done.
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