We just upgraded the firmware of our 7941s. All are good except one. It doesn't upgrade at all. I factory reset it by holding #, 123456789*0#.
After this, it's still not fixed. Then I directly connected it to a laptop as TFTP server with SEPxxxxxx.cnf, term41.defaults.loads, etc. with it.
However the phone is not responding at all. Then I factory reset it again the 2nd time. Now the speaker button & line button blink once, then it's dead. no power.
I also tried connecting a power supply but the same happens. the speaker button & line button blink once, then it's dead.
Can anyone help me how to troubleshoot it? Or the only thing I should do is forward it to TAC?
Add me in for seeing this before.
They will come back (as you saw) after waiting a long time or fiddling with it a while. Usually one or two stragglers and tough guys per set of upgrades / new phones/ reset / etc.
We had a similar issue here after an upgrade to 6.1.2. Not all of the phones were connected to the 10/100 SW port (instead were set to 10/100 PC port).
Once the phones were stuck like this we had to configure DHCP and connect the cat 5 cable to the correct port on the phone.