Here is a guide for downgrading any current PSP hardware version (TA-079 - TA-086) from firmware 2.81-3.50 to 1.50.

VERY IMPORTANT:
If you have a TA082+ motherboard and you downgrade to 1.50, currently you will be unable to upgrade to 3.30+ Sony firmware. This is due to Sony blocking updates when the PSP has been modified to run 1.50. There will be an application released later which will allow users to revert the changes. If you are using a TA082 motherboard then I would suggest just using 1.50 or OE until an application is released.

Requirements
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In order to downgrade a 3.50 PSP you will need the following:
- Original Lumines UMD (US or EU region)
- 3.50 Downgrader (In the Package)
- 1.50 Update (In the Package)
- 3.50 Update if you are on firmware 2.81 to 3.40 (In the Package)

The downgrader only works on Lumines, also known as Lumines Puzzle Fusion. It doesn't work for Lumines Plus, or Lumines 2.

Instructions: At Your Own Risk!!!
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Here are the steps to downgrade any 3.50 PSP to 1.50:
1 - If you have a 3.50 PSP skip to step 6
2 - Download 3.50 update from here:
3 - Unzip and place the file in <pspdrive>:/PSP/GAME/UPDATE
4 - On the PSP, run the 3.50 update from the memory stick under the Game menu.
5 - Delete <pspdrive>:/PSP/GAME/UPDATE
6 - Copy the contents of the folder MS_ROOT from the 3.50 downgrader ZIP to the memory stick
7 - Unzip the 1.50 update to a temporary folder. Rename the EBOOT.PBP to UPDATE.PBP and copy it to <pspdrive>:/PSP/GAME/UPDATE/ . DO NOT OVERWRITE PSP/GAME/UPDATE/EBOOT.PBP!
8 - Load Lumines and press x to start the game
9 - The screen will clear to black and fill with a light blue colour, then the PSP will reset itself
10 - Check that HEN is running by going to system settings, then to "System Information" and it should show up as system version 350 HEN
11 - If it is showing up as HEN then go to the memory stick and run the x.yz update
12 - If you have an unpatched TA-082 or higher motherboard, you will be prompted to allow the downgrader to patch your motherboard so it can be safely downgraded. The downgrader will not let you proceed without patching, if your motherboard requires it.
13 - Before the downgrader does anything to your PSP it will ask for you to agree to what it is doing, if you no longer want to continue press the Right Shoulder Button (R-TRIGGER).
14 - Once you have agreed to start the downgrade do not unplug the PSP, or try and restart it
15 - Once finished the PSP will ask you to press X, and reset itself
16 - If it comes up saying that the settings are corrupt, press x to continue, this will mean you will need to re-enter the settings for network connections into your PSP, otherwise go to step 18
17 - Load the included NetConfigBackup application in your PSP, and select to restore, this will take the backup that was done of the network config that was done automatically during the downgrade.
18 - All done now :-) Hopefully you now have a 1.50 PSP. Enjoy it responsibly.

Troubleshooting
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- If when trying to restore the network config using netconf backup you find that it gives you an error on the downgraded 1.50 PSP, try adding
a temporary network config, then deleting it and run the netconf backup again.

************************************************** *********
* WARNING, ANY DOWNGRADER HAS A CHANCE OF BRICKING A PSP. WHEN A *
* PSP IS BRICKED YOU WILL NOT BE ABLE TO USE IT ANYMORE. WE HAVE *
* DONE A LOT TO TRY AND MINIMISE THE RISK, BUT THERE IS ALWAYS *
* SOME LEVEL OF RISK WHICH YOU MUST ACCEPT IF YOU WANT TO *
* DOWNGRADE *
************************************************** *********

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