I just got a PM from "Posty" reading:
I think it is confirmed now that this does NOT work. It is not worth downloading unless you just want to look at it, maybe actually get it to WORK.I can say that it does NOT work at all. I have tried everything I could think of to get AVC to play, and it just won't work. It seems he did just pop in 2.0 PRXs into the 1.5 firmware, and called it a "custom firmware."
I think you should be able to trust me, considering I'm a team member for PSP-OSS :P But yes, I can confirm that there is no way in making this work.
Peace out --
Welcome to the Custom 1.5 Firmware Media Edition FAQ thread
Custom Firmware 1.50: Media Edition
The concept of creating a custom firmware package that will allow the best of both worlds above and below the 2.0 mark has been around for a while. Thanks to GameShark that's all starting to change. He has created the first "custom" firmware package that has all the abilities of a 1.50 PSP, but has the added media capabilities and codecs of 2.0+.
At the moment, you can only run this custom firmware using MPH's Firmware Launcher. Do not try to use this package as an actual upgrade. Here's what GameShark had to say:
1.5 - Full HB
2.0 Media Fetures
This is a Beta If there are any problems Just Let me know
I hope to add 2.0 UMD support to the next release
Also next release will be pacaged so that it can be added to an existing 1.5
Right now you need The MPH FW Launcher
UPDATE : It looks as if now the so called Custom Firmware is just the 1.5 dump with 2.0 PRX's thrown in. If this is correct then this custom firmware doesn't do jack.
UPDATE : There are rumors of AVC working and AVC not working. I personally cannot test as i have version 2.6 firmware. I need someone trustworthy to do a test and give me all the facts. PM me if your willing.
Q.Will this play 2.0 ISO's and UMD's?
A. NO. Not in this release. GameShark said he is working on getting that right.
Q.Does this release support AT3?
A. No. This release the psp freezes when you click the music button. And the only photo format is JPEG. There have been reports of AVC movies not fuctioning either.
Q.When will the next release come out?
A. Gameshark hasn't released any details about when the next release will come out.
Q.Someone said this will brick my PSP, is this true?
A. This has been tested and confirmed working.
Q.Does the web browser work?
Q.Why can't I just flash my firmware with it?
A. This MUST be ran through MPH's firmware launcher. If you try to flash your firmware with it it will indefinatly brick your PSP.
Q.Hey, will this work on eboot loader 0.9?
A. Nope, sorry. This can only be run from MPH's Firmware loader, and that needs 1.5 because the eboot loader doesn't support kernel, which the firmware loader needs.
Q.When I click the music folder, it crashes!
A This is a known problem with this custom FW, which is caused by the PSP looking at the PRX that contains the AT3 Codec library and seeing it as corrupt data, thus crashing it.
You can get this custom firmware here
You can get MPHFL here
Info about the MPH Firmware Laucher here
I will update this thread as information is found and questions are asked.