Downgrading phone Firmware

Discussion in '3CX Phone System - General' started by Rudolf, Oct 16, 2013.

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  1. Rudolf

    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:
    Yealink firmware that I want on:

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