How do I go back to 1.5 from 5.00 m33-6?

I see a bunch of recovery eboot's in my psp from my pc, I am on an m33, I know how to go to the m33 recovery mode etc, but how to I get my m33 5.00 psp back to 1.5 so I can update it to 3.90 m33-3? I want the LCS cheat device to work again. When I upgraded to 5.00 m33-6 and found it didnt work, and my save data was corrupted, i got really pissed. Thanks!

BTW: I tried going into recovery mode and I ran the 1.5 EBOOT.PBP and it went to a black screen, and after that it when back to the XMB homescreen with an error (800 something, can't remember the numbers)

Please help.

 

PLEASE THIS IS VERY IMPORTANT I WANT TO DOWNGRADE. I tried all the ways by searching on google but they just told me to recovery to 1.5 from the M33 recovery menu but my screen just goes black and comes up with an error YOU HAVE GOT TO HELP ME

 

No one knows how to do this?

I hate 5.00 M33-6 :'(

I ran the recovery and it said "The game could not be started. (8002013C)"

I'm getting really pissed off now. I'm about to sell my psp

 

"Noobz 1.50 downgrader" is your thing!

 

No, its not. That's for the 3.03 official firmware, I am trying to downgrade my custom firmware 5.00 M33-6 to 1.5 official.

 

Pandora battery and MMS

 

Don't you need specific hardware for this? If not, then I'll try it

 

Nope it works with all psp's capable of being modded, (except psp3000 atm and motherboard ta-88v3)
You have a phat though so you are all good, use the pandora battery and MMS