@ajeeshta1 What Firmware do you have installed now. If you have firmware newer then 5.03 then you need a pandora battery to make it custom. Otherwise if you have 5.03 you can use an installer called ChickenHen to Softmod your PSP with CFW. ChickenHen is the only way to softmod your psp into having custom firmware. (80010148) I believe is a firmware error. Anyway, If you have 5.03 or older. You can do it. If your version is older then 5.03, update then install chickenhen. (it's a tiff exploit)
@ajeeshta1 make an psp graderv008 but make an magic mem stick den a pandora then u use hell cat recovery flasher (easy to make) follow instruction and boom
You need custom firmware i have 3.90m33 to get this version you need a pandora battery and the m33 update on your memstick the pandora tricks the psp to install that version it doesnt mater if you have a older version it will still do it
i have psp 3003 , i will update 6.20.
but i se this video , i wand chang my psp v 6.20 to 3.71 m33-3
pleeeeees help me