Benh from the DCemu forums has posted a nice guide on how to install custom font on your 2.81+ psp....
Check out what he posted:
Hi all
I have found a way to get a custom font onto a 2.81 psp.
First of all is you have to have a 2.70 - 2.80 psp
You must first install the tiff font hack run it and istall your custom font. See my guide - http://www.dcemu.co.uk/vbulletin/showthread.php?t=36130
The once you have done that update your psp to 2.81 and once updated your custom font should remain the same as it was on 2.70 - 2.80
and there you have it
this should work even as you update to 3.00 when it comes out.
But once you have updated to 2.81 DO NOT PULL YOUR MEMORY CARD OUT WHILE THE PSP IS SWITCHED ON OR YOU WILL LOOSE YOUR CUSTOM FONT!!!!!!!
enjoy!
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Benh = C coder and LUA code