6921 phone downgrade from 9.0.2 to 8.5.x

Unanswered Question
Oct 2nd, 2010
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Hi to all,

i have call manager 7.1.5 and some cisco 6921.

Phones have a preloaded firmware (9.0.2) a nd i would like to downgrade to 8.5.x.

I installed new firmware but phone still run 9.0.2.(also i modified load phone name in device settings)

I have a language issue (6921 won't show thei button in italian while 7942 are ok) and i think it could be a firmware problem.

any idea?


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Christopher Graham Sat, 10/02/2010 - 09:47
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I'm not sure if downgrading is possible.  From the 9.0.2 release notes:

"After you upgrade from firmware release 8.5(4) to 9.0(2) and for subsequent firmware releases, you can upgrade or downgrade only to signed firmware releases"

The full release notes can be found here:



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