Fonthack Help!!!

I have just started using the fonthack specially made through the TIFF exploit on my 2.71 PSP, and I installed it, all went well, the font worked, no errors there, but the error was when I tried to launch the internet browser, it just freezes, and does nothing, and I can not move around the XMB, I have to reset the PSP to get the same thing when I try again, can someone help me???

Thanks in advance.