Hi I have several Extensions with more than one phone, ie one extension has two phones a Yealink T20 and T26. The T20 is at home. It appears within 3CX if an Extension has more than one phone you cannot upgrade the Firmware via the Phone Tab within 3CX, the button is greyed out. Does anyone know how to upgrade the firmware? If I remove one phone via the Extensions tab, then Phone Provisioning tab, I can upgrade the firmware, but this is a bit of a hassle, then having to reauthorise it.