I am trying to upgrade the SCCP firmware of a 7941 model, but the display locks on a upgrading message.
The new firmeware´s version is 8.X and the old one is previous from 7.X .
I found some Cisco documents that warned about the impossibility of a direct upgrade, if the 7941 old version was previous 7.X. In this case, I had to make a 7.X upgrade and, after this, a second upgrade to a 8.X version. But I´ve seen the document only after the problem.
I´ve reseted to the default factory conf and, after this, tried the upgrade through CallManager Express and a TFTP server (I´ve configured the .xml config file and uploaded all the files necessary to the firmware upgrade), but it didn´t work. I didn´t try to change the firmware to SIP and back to SCCP.
Yes SCCP v.7.x firmware is not supported by CUCM 5.x and Instead of downgrading the CUCM, i have a better option you may try, just try to upgrade the latest release phone firmware.
Try upgrading your 7941 phone to latest release of sccp 9.0(3) and this is a 2 step procedure
First upgrade to sccp 8.3.3 and then upgrade to 9.0(3)
For all sccp firware upgrades from firware release versions earler than 8.3(3) to version 9.0(3) or greater, you must first upgrade your firmware to version 8.3(3). once upgraded to version 8.3(3), you can upgrade your ip phones to version 9.0(3) or later.
I´ve tried to upgrade to the last SCCP firmware version (I´ve installed the 7941 9.0.3 firmware on the CUCM), but it didn´t work. The display of the fone remain in the "updating" process and nothing happens.
I will try to change to a SIP firmware and back to a SCCP firmware. If it didn´t work, I will have to install a 4.X CUCM version on a VM.
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