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  1. T48S - Firmware Not Upgrading from Version 66.9.0.96

    I recently got hold of a refurbed T48S that has firmware version 66.9.0.66 installed. The firmware versions available via Yealink and 3CX - namely 66.85.0.5, 66.86.0.15 and 66.86.0.160 do not upload to the phone successfully despite numerous attempts using the web interface for the phone. Each...
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