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We are trying to set the modem up with a different provider but the firmware is orientated towards Optus. Is there a more universal firmware available?
Only Optus firmware is available.
I would think that you should be able to use the internet features of the router with most other ISP's.
You won't be able to use the Phone (VoIP) features though (well not without a ton of messing about, end even then its not guaranteed).