If after inserting the USB drive the phone does not appear to recognize the firmware package and does not automatically prompt for the administrator password then an additional manual step may be required.
The affected models should now successfully recognize the firmware file and trigger the update process.
Additional releases in the same version will often include an letter revision code (e.g.
Note that it is possible to load the wrong firmware on a device in the event that the software packages are somehow mixed up between these various products.
Both Lync Server and Skype for Business Server platforms include this in-band firmware updating service and leveraging this capability is inherently available in the Trio as well.
This previous article outlines exactly how to configure VVX phones to utilize this and the same configuration applies to the Trio.
Once the 5.4.0 Rev BB release has been applied to the phone then this manual step will no longer be required for future updates as the phone will now recognize the correct firmware file names automatically.
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From a software standpoint the Trio platform is based on the same (UCS) platform that the entire line of modern VVX phones use, thus the majority of upgrade options are the same.