Can i downgrade my psp from ver 6.37 - Sony PlayStation Portable (PSP) Slim (PSP-2000) Console

how to downgrade psp 6.37 ver fw to 5.5 m33-6 without pandora battery and how work psp tool in 6.37

you can only download the version that has been ripped and designed to work on pirated or downgraded psp(as you may know it)
you see, there are no places where you can download full psp game that are still in the official format that the psp is designed to work with. the formats available are the .cso and .iso formats which would work only on psp that has been downgraded.
anything apart from this, im sorry is likely not to work.

there are no known ways of downgrading psp firmwares from ver. 6.00 and upwards. most methods would end up bricking(damaging) your psp

Hi. Unfortunately, there is no way for you to downgrade Ver 6.2. Pandora Batteries (the only known way to downgrade PSPs) do not work with the PSP-3000, and, as such, you can not downgrade it.

no.

You can't; not at this time, you will have to wait until a new FW is released.

http://www.wonderhowto.com/how-to-downgrade-psp-3000-5.51/

try this web site, let me know if it doesn't work

thx

You need to chip your PSP with Pandora's Battery and a 'Magic Memory Stick'
If you have a Fat or Slim PSP it works. If at the bottom of your PSP it says -3000 at the end, sorry but your PSP is unchippable.
After you downgrade your PSP to 'Custom Firmware' you can place ISO and CSO roms onto it.

WARNING: DOWNGRADE AND CHIP YOUR PSP AT YOUR OWN RISK. IT IS NO ADVISED BY SONY!

why would you want to go to that version.anyway check youtbe about unbricking psp and also check up on time machine.

MY PSP IS VER 4.0 CAN I DOWNGRADE IT?