Is it possible to downgrade SPL in a G4?

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i upgrade the ROM using this :

http://forum.xda-developers.com/showthread.php?t=283965

but I would like to downgrade it again to send for repair ...
i cannot flash it back to the original IMATE JAMIN rom , always stop at 95%.

Please help.

Just wait, suddently it continue.

Regards

"Just wait, suddently it continue."

No, it doesnt. Error msg comes out and forces you to it.
SPL can not be easily downgrade by flashing ROM in a G4.

Same problem

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I have same similar problem.

I created new topic. I guess my topic more explanatory.
Lets go on here -> http://forum.xda-developers.com/showthread.php?t=331474

thanks..

NOW it is possible to downgrade SPL. Just flash HardSPL, after that you can DOWNGRADE SPL to any SPL you want!!!

Originally Posted by nForce

NOW it is possible to downgrade SPL. Just flash HardSPL, after that you can DOWNGRADE SPL to any SPL you want!!!

When you first flashed HardSPL, which verson of the SPL was shown after reboot? That, what you had before, or the new one, of the HardSPL? I am asking, because I managed to keep the original O2 2.15 SPL and I really dont want to channge it (for repair reasons

After flashing the patched HardSPL I see 2.G4.4PDA (I have a G4 XDA Neo)! But the good news are that you now can flash all SPL versions you want, like the original 2.15 when it's inside of your ROM image and you can see it after rebooting!

How to use Hard SPL if a can't pass bootloader?

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I tryed hard SPL, but after upgrading it back to 2.20.001., and I can't pass even to "Windows mobile" screen and it is frozen this position.
Any suggestions?
Thanks