Is you psp a 2.5 out of the factory? It really dont matter if you use the US update. I would update if it is a factory, and as long as it isnt a TA-082 PCM then it should be fine

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It was 2.5 when i got it, I didn't update it. I would update it now to 2.6 but I can't find a japanese firmware EBOOT. That's the problem.
Doubleposted Message Below:
BTW, Monkeyboy, I did receive the mail u sent me. It was filtered in junkmail, who knows why Good thing i looked

Ok, a factory version of 2.50 is fine. No, you can use any firmware do upgrade, however there is no need. It is just as easy to downgrade from 2.50.

Follow this tutorial:

1. Download the "Downdater" from http://dl.qj.net/index.php?pg=12&fid=8566 The password for the archive is " I_Use_It_At_My_Own_Risk" without the quotes.

2. You need a dump of the 1.50 flash, which HAS to bee dumped from a 1.50, by DOWNDATER HELPER, which is included in the archive. If you know someone with a 1.50, please use that, because distributing the files is illegal. Otherwise, PM someone who has downgraded, and they may be able to help you out.

3. Place the folder which you "legally aquired" called "DOWNDATER" into the root of your memory stick.

4. Place the folder "DOWNDATER FINAL AUTO EBOOT" into the PSP>GAME folder on your memory stick.

5. Ensure the GTA eloader is installed and working.

6. Plug in the AC power adaptor

6. Boot up GTA and the Eloader, and select "Downdater test"

7. The Memory stick light will immediately start flashing, and will do so for a while.

8. The PSP should reboot itself into the screen you saw the first time you switch on a PSP; Set the basic preferances.

9. Your PSP should now be a v1.50.

You may encounter UMD errors that say "The disk could not be read". This is because the Drive hasnt reset properly, so remove the battery pack for 5-10 minutes, and they will stop. We suggest upgrading to 2.00 and downgrading back to 1.50, because the actual downgrade method we used is messy. This way, you will have a clean installation.

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Thank you very much. I will do so as soon as i find GTA. Thanks again.

You're welcome. Just incase anybody was wondering, yes, this guide is from my BETA version of my upcoming PSP help database.

And, please, check that your hardware is not TA-082, as you may render your unit permanently damaged when you try to downgrade. Please go to the following link to make sure you're set to go. It describes that the Modchip is incompatible, but it still serves the purpose of checking the Downdaters compatibility to your hardware:
http://www.modchipstore.com/support/...barticleid=164

And, be aware that although the Downdater has a relatively low chance of "Bricking" at this stage, there are a small amount of people who have destroyed their PSP using this.

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