We have 8 SX-20s installed in verious meeting rooms. I have upgraded most of them to latest tc7.1.4, all went well except one unit restared and showing "Missing Release Key" error MSG (image Attached). It also became unavailable on LAN. Following a post I did factory reset (Hold power button 10 sec and pressing P/W button twice) and it is still unavailable on LAN. Following another post I went to www.cisco.com/go/license and found this unit came with tcnc6.2.0. My question is, is there any way to downgrade the system FW to tcnc6.2.0 in a situation where the device is not contactable through network (LAN)?
Yes, if you still have the old software you can re-install it on to the SX20 to return it to the previous version... if you haven't overwritten it (with a 2nd upgrade), it's likely still on the device. You'll just need to use the "systemtools selectsw" command (logged in to the CLI as "admin"), or the Maintenance > Software Recorvery Swap item on the TC7 web interface to swap back to the previous software.
Technically, you could upgrade to TC7.1.4 as this fixes more OpenSSL bugs (beyond HeartBleed) even out of a maintenance contract, all you need to do is ask Cisco TAC and point to bug CSCup25163 - Multiple Vulnerabilities in OpenSSL - June 2014.
I often find that a failed upgrade is worth running again.
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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...
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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 ...