Created by dark_thug, this downgrader is for 2.50 TA-082 PSPs.

If you are a TA-082 user with a 2.60 or 2.71 PSP, you can downgrade back to 2.50 using the DAX generic downgrader.

So users of 2.50, 2.60 and 2.71 can all downgrade to 1.50… Or 2.71 SE-C!! You can choose 1.50 or SE-C. dark_thug gives a warning though: SE-C may lock-up while playing some games.
The catch? On 1.50, trying to change settings menu gives a Blue Screen of Death. (Read 4a. on the instructions for a possible fix)
This means you can simply not change your Video options, System settings, etc.

Homebrew, USB, Music, Videos, Pictures, Games; all remain.

On a brighter note, the BSoD could theoretically be fixed, using an app like X-Flash to flash a new system reg from a 1.50 user! Or, while making the dump, switch the 2.50 reg with the 1.50 reg. This is risky however.
The TA-082 Boards can also be downgraded to 2.71 SE-C! The BSoD will be gone. The catch again, you may not be able to return (to 1.50). If you can, it will most likely use the same update made to downgrade from 2.50. That still has not been tested.

Last thing, 0okm mentioned this before. Doesn’t matter if you choose SE-C or 1.50, you CANNOT upgrade to 2.50 or down. It will most likely brick your PSP! But you CAN upgrade to 2.60+!

UPDATE: If you downgrade to SE-C, you can still go to 1.50! Simply use the TA-082 program to make a 1.50 update folder, and use SE-C’s RECOVERY Mode to run the update!

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Instructions!

1. Use the DAX generic downgrader to change your ver. to 2.50 if it isnt already.
2. Downloaded the 2.50 TA-082 Check & Dump v1.20 to dump your firmware.
3. Enter your settings in the executable. Here is an example:

4. It will generate the downgrader. Copy the folder ‘UPDATE’ (the folder it makes) to x:/PSP/GAME

EDIT: 4a. Restore your System Setting to Default. This may solve the BSoD!
5. download eLoader and put it on your PSP. Load it from the photo menu.
6. Choose ‘UPDATE’ from the eLoader menu. This wil begin the downgrader. It will patch your bootstrap to make it a 1.5.
7.Reboot your PSP AFTER it has finished COMPLETELY! You should get a blue screen. Hit O and restore your settings.

Files you will/may need:

TA-082 Downgrader

TA-082 Dump & Check v1.20 - Download Via Comments

DAX 2.71 Generic Downgrader - Download Via Comments

eLoader 0.99 - Download via Comments

I can not stress this enough: If you do not know what you are doing, don’t attempt this! There is a high chance of bricking your PSP! Use at your own risk! I would love to thank dark_thug for the downgrader, and 0okm for the work he has but into TA-082 PSPs!

And of course, to xPSPx Skull xPSPx from PSP-Hacks for being brave enough to test this!