13.37 is a 'special' firmware spoof (regular spoofs only go up to 9.99)
it stands for 'leet' (it means something but icant spell it)
when peple spek like this, 'ZOMG!!1! H4X0RS!!!11!!1', they are speaking 'l33t'
the 1 is actually added on to the writing(it then reads 'System Software 1') then the firmware is spoofed to 3.37 giving the impression of 13.37.
I tried but it didnt work on OE-B for me
it doest do anything except change firmware number shown by your PSP
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