Internet speed is very slow intermittently.
Wifi Range is also less.
Please advise if there is any chance if problem will be resolved by Firmware upgrade.
I have got Archer v1600 with below details:
Firmware Version: 1.1.0 0.9.1 v5006.0 Build 180828 Rel.35294n
Hardware Version: Archer VR1600v1 000000
There is no need to upgrade the firmware on your ARCHER ARC1600 to get an improve on yourTPG FTTB internet connection.
If your the issue is slow speed, I may sugest you to perform the following troubleshooting
You also can try with another VDSL2 modem if possible