Originally Posted by deeevan
This isn't answering your question, but I can clear up some things so you can focus on it.
The Optus AU in the OTA filename isn't an issue or related to your sim issue. The unbranded phones share the same firmware (980) as Optus phones.
The OTA failed because you are still using a custom recovery (I can see cwm in your photo). Extract the stock recovery.img that's inside the nandroid and fastboot flash it before trying to apply the OTA again.
Are you sure your phone is simlocked? Or just a faulty Telstra sim and a working Optus sim.
Thanks for your response. I think you're right.
The OTA update failed because I'm using the CWM recovery, however I thought because it referenced optus, the phone thinks it's Optus locked. I didn't know the unbranded phones and Optus shared the same OTA update file.
With regards to my sim card, I've actually got an nano sim in a micro sim adapter and inserting it in the HTC One, this has worked beautifully for me since day one, just recently it started to fail. I have tried the same nano sim in micro sim adapter in an old iPhone 4S, and it worked there too.
The strange this is every time I insert a singtel/optus sim into the HTC, it detects it straight away. But not my Telstra sim. Perhaps it's something else?
I guess the other thing I can try is flashing the firmware again? But I can't seem to find 1.29.980.2 firmware.