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Cisco IP phone 7911 are not updating firmware.

Two months before Cisco call manager was crash then we resotre the call manager. 

In ccm page its shows the current firmware was "SCCP11.9-1-1SR1S"  Then I upload the SCCP11.9-2-1SR2S this version on cluster but  70% phones are no updating.

I restart the CCM service as well as the TFTP services but still same, Then I upated one more higher version but its same not updating.

When we are doing ip phone on factory default then its updating. So I want to know that why most of the phones are not updating via CCM.

The running CCM version is:8.5.1.10000-26.

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Hall of Fame Master

Cisco IP phone 7911 are not updating firmware.

Sounds like ITL cer issue, open TAC case as they can provide nice tool for clearing the certs.

HTH,

Chris

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