Hi Smart Internet Peoples I need to downgrade Yealink T20P firmware. If I do it through the 3CX system it doesnt apply the firmware (stays on the newer FW), just restarts the phone. Used the same method to upgrade the phones. I can downgrade fine if I do it on the phone itself (via Web interface) Any idea how to do this from 3CX? 3CX Phone System Version 11 - Service Pack 4 - Build 28976 Yealink firmware that is on now: 126.96.36.199 Yealink firmware that I want on: 188.8.131.52 PS: 184.108.40.206 causes a limit of 1MB/s transfer speed for PC / laptop connected through it. and there is a Call recall issue (call recall issue was reported but not tested) 220.127.116.11 has not been marked safe for 3CX from the Yealink site, lesson leared.