You can definitely downgrade to an older firmware.
You can do it by changing the firmware build that it's to look for under Device Defaults or in the device settings itself in CM under "Phone Load Name" but the name of the firmware there for that phone if you want to only do a phone or 2. In either case, restart TFTP if you change either and reset the phone.
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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 ...