Downgrade CP 8861 SIP firmware

[igorbarney]

Hi Guys. I'm trying to downgrade a CP 8861 from SIP 11.7(1) to SIP 11.1(1)MPP firmware but without success. I'm working with a Tfpt server instead CUCM. I got different messages about CTLSEP<mac>.tlv, ITLSEP<mac>.tlv, ITLFile.tlv, SEP<mac>.cnf.xml, DialPlan.xml files missed. Can someone help me out this issue?

Thanks.

[Chris Deren · Accepted solution]

You cannot switch from Enterprise load to MPP load, you have to by those phones as MPP, here is similar thread:

https://supportforums.cisco.com/t5/ip-telephony/upgrade-cisco-7841-to-mpp-firmware/td-p/3089077

[igorbarney]

Very helpful your answer. I was wasting my time on it. Thanks