Welcome to the Community!
I checked your account using your community details and found out you're on a TPG-FTTB account. Your modem's firmware already has the latest version.
The firmware version of the Huawei HG659 used for TPG-FTTB accounts is different from that of the ones we provide for NBN accounts, albeit they're of the same brand/model.
I hope this clears out the confusion.
... View more