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I have a 2-wire setup (ip-gateway) with 1x VTO (modular) at front door and 3x VTH for each floor. The default factory image was v3.12x (non-SIP) and has been upgraded to v4.3 SIP. The upgrade from 1 of 3 VTH devices failed but could be recovered using TFTP method. Upgrade Steps: - upgraded...