Hi, the best for you is to upgrade you firm, you can get it here with instructions....
Installation for an OE/M33 firmwareInstalling 3.52 Custom Firmware on an OE or a M33 PSP:
You may use the Installation Video
instead, if you wish. If you do not want to, please continue to read the guide:
1- Copy the folder 'M33CREATOR' to the directory; 'X:/PSP/GAME150/' on your PSP's memory stick.
2- Download the official 3.52 update: here
and rename to 352.PBP.
3- Copy the 352.PBP to the directory; 'X:/PSP/GAME150/M33CREATOR/' on your PSP's memory stick.
4- Download the official 1.50 update: here
and rename to 150.PBP.
5- Copy the 150.PBP to the directory; 'X:/PSP/GAME150/M33CREATOR/' on your PSP's memory stick.
6- Execute '3.52 M33 CREATOR' under GAME on your PSP.
7- Then execute '3.52 M33UPDATE' under GAME on your PSP.
8- Once finished, press X.
Have fun on 3.52 Custom Firmware!
After you made this you can upgrade to a new oe firm like 4.01 m33