1.50 to 1.00 Downgrader - Custom Firmware (decent success rate, I have NOT tested)
edit : the site i was linking to is banned (site link and download link removed)
Browsing around today I find this interesting tidbit. Basically the just of this, is that they have loaded a custom 1.00 firmware on a 1.50 system by downgrading it. The author states that this might be a doorway for using custom firmwares allowing homebrew on a firmware that allows the same features as a 2.0 or 2.6 would. Earlier they reported bricking a few PSP's while testing, but apparantly this works fine with ONLY 100% STOCK 1.50 units.
Take it for what its worth. I cannot test this as my unit has been downgraded, so I can't reassure you of anything. When you download files from the internet you are taking a risk that you assume and take full responcibility for. Please be aware that only you are able to put files you download on your PSP and activate them.
Recently we brought you news on the SXT Firmware Flasher. Well now we have some big news regarding it.
It has been confirmed that 100% of 'virgin' 1.5 PSPs downgrade to 1.0 smoothly.
How do we define 'virgin' firmware 1.5 PSPs? If you BOUGHT your PSP with the 1.5 firmware ALREADY on it, and have NEVER upgraded or downgraded since the purchase, then you have a virgin PSP.
Out of 5 tests on these untouched firmware 1.5 PSPs, 100% of them downgraded to 1.0 without a hitch, and with region coding removed.
EDIT: 4 MORE confirmed reports of untouched 1.5 firmware PSPs being downgraded to 1.0 successfully have been sent to us. This brings us to a total of 100% downgrading or 9 out of 9 successful attempts. Expect a video of the whole process coming soon!
What does this mean? Devs can NOW start making custom firmware for the PSP. The process used by the firmware flasher is using custom code to replace the NAND memory with new root files. Therefore, since we are NOT using the upgrade EBOOTs to downgrade, almost ANYTHING can be written to the firmware.
Team SXT, Yoshihiro, and [teamnamehere] are currently working on finding out how to get this firmware flasher to work with all versions of the 1.5 PSP, so that we can have custom firmware for all!
Think about it. All the features on the new 2.6 firmware on a CUSTOMIZED firmware which is made by devs to support homebrew, yet have all the features of 2.6, and more, as we can now incorporate Flash and other codecs, like DivX into our custom firmwares.
I will not host the file here. The main site is banned so I do not feel like rehosting it somewhere else. Search for more info if you are interested i guess ;)