Hmmm. That's strange, as the downdater doesn't downgrade as such, it just writes unpacked 1.5 flash files to the Flash, so therefore the Downgrade might not be up to full standard.

The 2.0 downgrade actually uses the official sony updater to revert to 1.5, so therefore you should have an authentic 1.50, just as if you had updated from 1.00.

That is very strange.

However, Devhook is very hard to work out at first, so follow this guide and it should work:

1. Download a 2.00 or 2.50 update file

2. Using PBPunpacker or PSPBrew, extract the file called "Data.PSAR" to the root of you memory stick.

3. Make sure you have at least 25-35mb of free space on the MS

4. Download DevHook v0.41d

5. Unzip using WinRAR, and browse to the following folder "Devhook041d>MS_ROOT>" Extract both of the folders in this directory to the Root of the MS.

6. On the PSP, browse to Game>Memory Stick. Select "devhook firmware installer".

7. Follow the instructions in the application

8. When you're finished, open "DEVICE HOOK" from the game>Memory Stick Menu.

9. Hover over "Firmware" and press circle.

10. Depending on which Firmware update the DATA.PSAR was from, select the appropriate Firmware and press circle

11. Hover over "Boot select", and press circle. Select "Reboot XMB" and press circle.

12. Select "Start" from the menu. It should then reboot into a newer firmware . If not, and it freezes, try again. If still no luck, repeat steps 2, 3, and 7-11.
You need to repeat step 2, because the DATA.PSAR is automaticly deleted.

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Ok guys, listen up. This is what I did...

had 2.01, downgraded to 1.5, then 2, then 1.5 again.
downloaded devhook, downloaded 2.5 fw
used a pbp unpacker to get that psar from the 2.5 fw
put the 2.5 psar in the root, everything else from devhook in the appropriate place.
load up psp. load up devhook fw installer, follow the prompts
load up devhook sample launcher and do all the settings mentioned previously. u now have 2.5
if u turn off the psp u have 1.5 again, if u run devhook sample launcher u have 2.5 again
simple

i tried this several times, but no luck

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How risky is it to up and down from 1.5 to 2.00?
Took this from readme:

devhook FW2.50 with MemoryStick file root directry.
flash access is redirect to this directry.

You should be copy all files of flash0/flash1 and reboot.bin.
replace flash0/kd/*.txt with plain modded config files.

But I dont understand, its not proper english...
Whats a plain modded config file?

Don't bother with the readme. The Guide i provided is really the only way to do it.

It is not risky to downgrade, if you follow instructions.

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Go to planetpsp.org and go to downloads then iso loaders then look for DevHook041d Full package download that. It has all the files in the download.

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I had the same thing as you guys had, repeating the steps as pj1115 didn't help either. But what helped me was formatting the memory card. Then everything worked fine

Thank you, will try that tomorrow!

IT WORKED I AM 1.5, YES YES YES YES YES YES YES YES YES EYS THIS FEELING IS ORGASMIC LMAO I AM SOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO HAPPY DIUFDSIUF;KGDDFIYGDIF;SAIFYGSA;FISAIFGIUFGO YAYYYYYYYYYYYYY
GO ME IT AINT MY B-DAY BUT IM GONA PARTY LIKE ITS MY B-DAY IMA FK SHOWTY LIKE ITS MY B-DAY BUT I KNOW YALL DONT GIVE A FK THAT ITS NOT MY B-DAY OHHHHHHHHHHHHHHHHH YEA

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