Unlike retail routers, the HG8346m contains custom firmware (often labeled V300R015 or V300R016) tailored to your provider's network (e.g., VLAN IDs, TR-069 remote management). Installing generic or wrong-region firmware can (solid LOS light).
A: Very unlikely. Regional variants have different optical modules (power levels, frequency) and VoIP codecs. You could lose sync with the OLT. Huawei Hg8346m Firmware Download -