Thanks for reaching out to us again, albert1184!
I can confirm that your modem already has the latest firmware version. I recommend having a read on this article to try and solve the issue on your Wi-FI:
Let us know should you require further assistance.
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How can i install the latest firmware for my modem please? I'm on TPG fttb.
Firmware Version:1.1.0 0.9.1 v5006.0 Build 180306 Rel.63433n
Hardware Version:Archer VR1600v v1 00000000