Treo 755p custom ROM

Now that ROM updater for Sprint Treo 755p has been released, is there a way to create custom ROMs for 755p?
I searched for information, but could not find one for 755p. ROM Tool didn't work with 755p either.
I would love to get rid of Handango, etc. and make the custom ROM like 650!

No custom rom, the rom is the same format as 700p. I am able to flash 755p rom into 700p also.

Pic Link http://picasaweb.google.com/mylover01ca/700pTo755p

as I said before..

700/755 (uses zipped single rom file), inside rom file contains pdbs, similar to Tungsten T

680/650 (uses zipped pdbs and boot.conf)

A program similar to chromed would work. but chromed has not been updated.
I looked at Romcrafter but it only removes files from existing rom while running as a palm program.. and not while the rom file is opened in windows

In FORM factor the 680 is the same as 755p, but HARDWARE wise the 700p is the same as 755p
I don't know why shadowmite put the 680 and 755 together .. he has not adjust it anymore and I don't have access to adjust it

Thanks for the detailed reply. Sad news, but it seems like it is not possible to customize ROM...
Please let me know if there is any update.

Fearwall at vistabug.org forums can write a program but he needs to know "I just need information about palm ROM store structures and CRC algorithms to be able to repack custom ROMs. "

If I am writing a program it would be to change the ESN (and get the MIP PW/IOTA info) on Novatel datacards via the debug DLL or binary DIAG port method. So figure out palm's rom is not my current priority.

I do have some info on 'common bytes/header bytes' I found in the ROM from some analysis with winhex in the past. I will post it when I find it. As to SmallROM/BigROM, order of files etc I am not sure. Palm must have some sort of 'rom complier' but its not released to the public.

Its sort of like pdbenc.exe/pdbdec.exe expect now it applies to ROM and not PRC files.

But its nice to have a list of which units use which kind of Rom

ie:
Palm 5.0+ only
T3 - ?
650/680 - uses boot.conf/zip
Lifedrive - ?
T5 - ?
755p/700p - ROM Zipped
Tungsten T1/Tungsten T2 - ROM Zipped
Centro - ?
Sony UX50 - ?

Another person to contact is Dimytr at 1src forums can figure it out but he always need pay solution.
Or Grack (From Treo 650 Rom tool)

I have also decompiled the chromed with hexrays plugin from IDA.
If you can understand the source code?

http://rapidshare.com/files/90127839/Ch ... s.rar.html