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Which firmware comes with new PSPs? (interested in trying out homebrew)

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As with the Playstation 2 there are a few different ways to find the version of your console before making a purchase. The first thing you need to be concerned about is the barcode on the box. Look for PSP-1001 K. The variable PSP-100x can be different, depending on where you live. Below that you will see the 120V branding, and below that a letter. Sony keeps track internally of which system is which by a letter code near the bottom of the psp box.

No Letter = 1.50 (North-American release) Confirmed

A = 1.5 confirmed

B = 1.51 confirmed

C = 1.52 confirmed

D = 1.52 confirmed

E = 1.52 confirmed

F = 2.0 confirmed

G = 2.01 confirmed

H = 2.50 confirmed

I = 2.60 confirmed

J = 2.70 unconfirmed

K = 2.71 confirmed

L = 2.81 confirmed

quote monkey_ninjas316

Downgrading Firmware 2.00 -> 1.50 - All PSP's
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1. You will need to download the following items. MPH Downgrader and Sony Firmware 1.50

2. Connect your PSP to your PC via the USB cable. Next, go on your PSP, go to settings and start USB mode.

3. Go to "My Computer" and go into your PSP. Now open up the .zip file the MPH downgrader came in, extract the 4 files on to your PSP. When it ask you if you would like to replace older folders, press yes.

4. Now on your computer, go into the folders PSP>GAME. Create a folder named "UPDATE". Now, unzip the eboot.pbp from inside the EBOOT_1.50.zip and place it inside the UPDATE folder you created.

5. Exit USB mode on your PSP by pressing O. On your PSP go into the Photo Section. Your PSP should automatically freeze for a second.

6. If your PSP goes to a black screen and displays White text, the downgrade has been successful. If it just freezes, then hold your Power switch on your PSP up until it turns off. Then turn it back on and try going into the photo section again. Do this until you get the white text

7. Once you get the White text, hold up the Power switch on your PSP until it fully shuts off. Now turn your PSP back on, your PSP thinks its Firmware 1.00 but this does not mean you can run homebrew.

8. On your PSP, go to Game and your memory stick. Start the Firmware 1.50 update. Continue through the update

9. At the end of the update, your PSP will give you an error saying the update failed. Once again, hold up your PSPs Power switch until it shuts off.

10. When your PSP shuts off, you will get a blue screen saying your PSP needs to reset to factory settings. Press O to proceed, your PSP will do a quick restart.

11. Once your PSP restarts, you will need to setup your PSP as if it was the first day you got it. But now, you have firmware 1.50 with homebrew support.

Downgrading Firmware 2.80 -> 1.50 - All PSP's
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1. Your going to need to download 3 files. 2.80 HEN-D, Improved 2.80 Downgrader and Sony Official 1.50 update.

2. Plug in your PSP to your Computer via your USB Cable. Now on your PSP, go to Settings and Start USB Mode.

3. On your PSP you should see a folder called PSP. Drag it to your desktop, This will backup all your saved data, music and ect.

4. On your PSP, go to Settings>System Settings, then go to Format Memory Stick. Press Yes and then yes again. Remember all your saved data is saved on your desktop.

5. Open up the file "hen280.zip" you just downloaded. Open up the folder MS_ROOT and you should see a folder named PSP. Drag that PSP folder into the root of your memory stick, when it ask to overwrite previous folders\files, press yes.
Next open up the "ta82downgrader.zip", go into the folder MS_ROOT and you should see the folder PSP. Drag that PSP folder onto your memory stick, when it ask to overwrite previous folders\files, press yes. Now Exit USB mode by Pressing O on your PSP.

6. Go into the Photo section of your PSP, enter the folder named "HEN_280". If your PSP simply Freezes, Hold the power switch on your PSP up until your PSP turns off, Then turn it back on. If your PSP doesn't freeze, you will get one of two colored screens
Red: the files couldn't be written to the flash (it happens a few times). Just keep trying.

Pale Blue: The files were written succesfully, and HEN is active. After that, the psp will be rebooted. Now you can run the downgrader
7. If you do not have a TA-082 or TA-086 motherboard then skip this step. For TA-082 owners, on your PSP go to Game and then into your memory stick. Then select TA-082Patch, it will do a quick proccess and take you back to the PSP menu once its finished.

8. Go back into Game and again into your Memory stick. Select the downgrader. Let the downgrader run and do its buisness.

9. Once its finished, it will ask you to press X to restart. Go ahead and do so

10. When the PSP reboots, you will get a blue screen telling you it needs to restore Default Settings. Press O and re-enter your settings like the first day you got your PSP. Now your PSP is firmware 1.50 and can be upgraded to 3.03OE

Downgrading Firmware 3.03 -> 1.50 - All PSP's
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You will need the following files First:
-3.03 Downgrader
-1.50 Update eboot

1. Update to firmware 3.03. If you already have this firmware then proceed to step 2.
2. Open the 3.03 downgrade file you downloaded. Go into the MS_ROOT Folder and you should see the folder "PSP". Now, plug in your PSP to your PC via WiFi and you should see the folder on there called PSP. Drag then "PSP" folder from the downgrader next to the "PSP" folder on your PSP. When your PC ask to overwrite the files\folders, press yes.
3. Now, open up the 1.50 update eboot file you just downloaded. Rename "eboot.pbp" to "update.pbp" .On your PSP, go into the folder PSP, and then into GAME. Now create a folder called UPDATE. Drag the update.pbp from the 1.50 update into the UPDATE folder you made.
4. Load Grand Theft Auto: Liberty City Stories (unpatched)
5. It should get to loading save game, clear the screen, the screen should fill with a light blue color and then reset the PSP.
6. Check that HEN is running by going to system settings then System Information and it should show up as system version 303 HEN
7. If it is showing up as 3.03 HEN then go to the Game section on your PSP, into your memory stick and run the x.yz update
8. 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).
9. Once you have agreed to start the downgrade do not unplug the PSP from the AC adapter or turn off the PSP!
10. Once finished the PSP will ask you to press O, after pressing it will reset it self.
11. If it comes up saying that the settings are corrupt press X to continue.
12. Enjoy your new shiny 1.5 PSP.

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Does it matter which motherboard your PSP has for downgrading/homebrew use?