i have 3.40 oe, a 3.6V 1800 MAH sony block battery, PSP FAT, 1GB magicgate sandisk MS. I downloaded DESP5, but i was reading over the readme and it scares me a little.
- Press X to install 3.90M33.
- Press O to install original 3.90
- Press  to dump nand to nand-dump.bin. When done, psp will auto shutdown.
- Press L+R+HOME+start to restore nand from nand-dump.bin
This proccess is very dangerous, and you should *just* use it if it's your
last chance to get it working.
My psp is NOT bricked, should i just ignore that part?
So what i would do is, get the 150,340,and 390 update eboots, put them where they should be, run desp5, and it will install m33?