Technically wouldn't you just have to Unassign Flash0 and Flash1 the assign them to a folder on the Memory Stick which would contain a higher version of Firmware like 2.50. For example:
Code: Select all
sceIoUnassign("flash0:");
sceIoUnassign("flash1:");
sceIoAssign("flash0:", "msstor0p1:/" , "fatms0:/flash0/", NULL, 0);
sceIoAssign("flash1:", "msstor0p1:/" , "fatms0:/flash1/", NULL, 0);
sceKernelLoadExec("disc0:/PSP_GAME/SYSDIR/BOOT.BIN",0);