You can see your current firmware from your PSP (always check it this way), by entering the system menu, then system information, and it should show your firmware version.

Time to Downgrade!

Now, according to the firmware you have, you can downgrade. If you have 1.50 or left, you don't need to downgrade (as you already have the desired firmware, lol). If you have higher than 1.50, pick your best method:

1.51 - 2.00

For these firmwares we have the easiest way of all, we are proud to present...

• 2.00 Downgrading Method

Update to 2.00 if you have less, and try that method! (there are NO requirements)

Of course, another option isthe Pandora's battery method, that you can always use, for any firmware (requires extra battery + another 1.50 PSP to copy files)

2.00 - 2.71

There is another downgrading method for these (like the 2.00 one, there are no requirements). If you have these firmwares, update to 2.71, and try this method!

• 2.71 Downgrading Method

Again, another option isthe Pandora's battery method, that you can always use, for any firmware (requires extra battery + another 1.50 PSP to copy files)

2.80

If you have 2.80 firmware, we have another method for you! Once more, there are no extra items required, so you can try it now!

• 2.80 Downgrading Method

Once more, Again, another option isthe Pandora's battery method, that you can always use, for any firmware (requires extra battery + another 1.50 PSP to copy files)

2.80 - 3.03

If you have more than 2.80, you will have to use another kind of downgrader. It requires an unpatched UMD of Grand Theft Auto: Liberty City Stories (GTA: LCS for short). You will have to buy that game to use this method. And I say unpatched because new versions of the game have been patched by Sony so they no longer work. So, it IS hard to get this game, I warn you.

• GTA Downgrading Method

As it is hard to use this method, I really recommendyou to use the Pandora's battery method, for any firmware (requires extra battery + another 1.50 PSP to copy files).

Or, you can also upgrade to 3.50, and use the Lumines downgrading method (explained below).

3.50

If you have your firmware up to 2.50, you can use this method. However, it requires to have a legal UMD of Lumines, that, like the GTA: LCS, is a little hard to get. Here is the guide:

• Lumines Downgrading Method

As it is hard to use this method, I really recommendyou to use the Pandora's battery method, for any firmware (requires extra battery + another 1.50 PSP to copy files).

3.50 - 3.71+

If you have more than 3.50, then only available method is Pandora's battery. It is the most amazing method of all, and it is a little complicated, but you can do it. It is also very safe, as you cannot brick your PSP (and unbrick it if you have it bricked). This method requires extra battery + another 1.50 PSP to copy files. You also need a Memory Stick PRO Duo, to turn it into a Magic Memory Stick (more info in the guide).

• Pandora's Battery Method

You are free to enjoy it!

Final Note

When you are done downgrading, you should have an 1.50 PSP. You can continue with the Hacking your PSP guide, now with your 1.50 PSP, so you can enjoy all the "unlocked" features.

That's all, enjoy the guide!