Can I downgrade firmware on a 7912

Hi,
I have the latest signed load on a 7912.
Can I downgrade it ?
I did manage to do it accidently, by pressing some key combinations on the phone, which cause the phone LCD to blank out, but would rather do it the prescribed way.
I have read that its not possible to downgrade from a signed load, but since I did manage to do it accidently, I am sure its possible.

Yes, I am aware that you can downgrade from signed to signed.
I however managed to completely wipe out a 7912, and get it to a state where the LCD blanked out, and the hold and config lights where steady red/green.
The phone had a signed firmware earlier.
Its probably because I interrupted a firmware load by pressing some key combination, but am not sure exactly what I pressed :-(
One thing that did happen, was the phone started ringing at one point, flashed a message saying "Upgrade sucesful" and then got into this "locked" state.
Perhaps I hit upon some unsupported "feature" (?)
I was then able to load an unsigned firmware onto it.
I had to however rename the unsigned firmware file from CP 7912xxxSCCPXXX.zup to cp7912r.zup in order for the phone to download it via tftp.
Thanks
Shahed.

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This question was solved.
View Solution.

Hello BHVampire,
Welcome to the HP Forums!
I understand you're unable to scan a legal size paper after upgrading the firmware using the Officejet 8600 Plus. I will do my best to assist you! I have just sent you a private message. If you're not sure how to check your forum messages, this post has instructions.
I worked on behalf of HP.

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