Factory reset should be the last option after trying all other troubleshooting steps. Before doing factory reset,we need to make sure the phone has access to DHCP server and TFTP server ponited in teh DHCP scope with the phone load.
Have you already tried deleting the ITL file on these phones before factory reset?
In your case, as this phone is not coming up after factory reset, the only option to bring up this phone is to setup a DHCP & TFTP server in your network and manually load a firmware.
After extensive testing, I found that when we orginally setup our network, we used a VLAN 999. Later on, we upgraded our switches, and the VLAN information was not required for the phones to work. But, the ring list files, for some reason were not accessible. Reentered VLAN, and then the ring list and trust list issues went away for me.
I am now looking for where those files are pointing, and will try to get them out of the VLAN so everything works without it.
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...
This document describe how DST changes and how time changes are
implemented in DST. Daylight Saving Time (DST) is the practice of
setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...