Ok, you do not need to change your iconz, font ect!
Just go on google! type 3.40 OE Winstaller, the top one!
download the file! once its finished run the .exe you downloaded and plug in your PSP to PC
Blah blah your all done! run the 3.40 update from game section of the PSP! read the red writing and press x!
when its done press x to shutdown and your done!
restore factory settings after you updated! this will sort out your flash1
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