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Downgrading phone Firmware

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Rudolf

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Jul 4, 2012
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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: 9.71.0.140
Yealink firmware that I want on: 9.70.0.168

PS: 9.71.0.140 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)
9.71.0.140 has not been marked safe for 3CX from the Yealink site, lesson leared. :(
 
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