Restoring Extended ROM??

[odyseus]

Hi All,

There are many posts about updating ROMs (OS & Extended) to the latest version (Eg 2.8.7.102), but there isn't much information on how to revert back to an earlier version of Extended ROM which, generally has the customisation files from the service provider.

What I would like to know is how to replace the files in the extended ROM with ones from a backup source (ie I used aWizard to copy the extended ROM and there is a RAR file of these files on the Xda-developers FTP site).

Also, I wonder what file needs to be altered (config?) so that you can cherry pick which CAB files etc to load on reset.

Finally, there are posts which seem to be saying that with the latest ROM's 1.6.x.x and above that you can no longer write files to the extended ROM.? - although you can use Total Commander to delete these files so that they don't reload on a soft reset (But probably reload after a hard reset?)

Sorry is this is going over old ground !!

Many Thanks in advance

John

[edsub]

With 1.6.x and above version your ExtROM is read-only.
To customize your ExtROM:
1. Backup cab files you like from ExtROM (ie the Operator ROM)
2. Flash your device using RUU
3. Test functionality of the backed-up cab files by manually installing them one at a time
4. Backup OS, Radio and Ext rom using aWizard
5. Flash your device with a 1.5.x version using RUU
6. Replace the files in ExtROM with the ones you like on the new rom (from step 3 as well as the backed up ones from step 4!)
7. Restore OS and Radio using aWizard

You now have the same rom as from step 2, but with customised ExtROM