Online updates were discontinued a firmware or two releases back now simply because while it was never a problem for the vast majority (and for me I could never re-produce this at all) but some, not many but significant enough had an issue where it 'bricked' the hardware when making an online update. We think it was probably something to do with them being on mobile ISPs and perhaps a change of IP during update but bottom line decided to remove the possibility out of the equation so while it's technically possible for the firmware to support online updates then it won't be doing because we have disabled it server side, so long story short, it's USB updates only. 👍