http://blog.brightpointuk.co.uk/huaw...date-available
If anyone wants generic unbranded firmware managed to find it here.
No idea if it will flash on a '3' 538x since the one I wanted to recover was a generic unit.
Also it's for the Older Mi-fi so don't go flashing it on the new ones (The older ones had LED indicators where the newer ones have a nice OLED display)