cannot update 7921G to 1.3.3 via USB

Unanswered Question
Apr 6th, 2011


facing some issues to firmwareupgrade/downgrade of several 7921G Phones via USB.

I can upgrade downgrade phone to different software versions (1.3.4, 1.3.4Sr1, 1.4.1). I have downloaded the 1.3.3.tar several times same error.

Only up/downgrade to 1.3.3 fails "error in browser" "error in uploaded image"!!

Does anybody know why und how to solve this problem?

regards Chris

I have this problem too.
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Davide Fiumi Thu, 05/26/2011 - 04:41

7921 phones with Hardware Revision of 3.6 do not support firmware 1.3.3 and earlier.

You see the Hardware Revision of a 7921 through the usb cable upgrade process.

The big issue here is that firmwares from 1.3.4 to 1.4.1 (currently latest version) just suck.

christian.geissler Thu, 05/26/2011 - 04:57

Hello Davide

On monday i try a phone load that i have got from TAC.

Maybe this load works for my enviroment, well see....

regards chris

Davide Fiumi Thu, 05/26/2011 - 05:16


What kind of phone load is that? What version? Would you be so kind as to share it with the community once you get it?


christian.geissler Thu, 05/26/2011 - 05:58

version is wich is TAC release.

I don't know if i have the permission to share this Image!

After some test's i will ask the TAC engineer.



Davide Fiumi Sat, 05/28/2011 - 03:50

Well, it would be very appreciated if you could ask TAC permission after your tests, since the current firmware is really really bad.

Thanks in advance.

m.gajsek Mon, 05/30/2011 - 02:14
There is a new image to work on this hardware revision .

Namely, had the same problem last week.

migilles Mon, 08/01/2011 - 23:29

You will need to open a TAC case to get any ES load for the 792x phones.

Software is not to be shared via this forum.

Sent from Cisco Technical Support iPhone App


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Posted April 6, 2011 at 5:48 AM
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