Wi-Fi button stopped switching on after just 1 month.

[MOMO11SpeedUK]

mine being Momo11 speed_VO3 20130221

That's not your individual model number, that's the Build Number which is just a notifier of which firmware you're running.
Your serial number will be something like MO11SPD16GV0xxxxxxxxxx.
The s/n is printed on the rear of MOMO11 Speed tablets, but they seemed to have forgotten to print it on the MOMO11 II - jeez!

EDIT:
Give this firmware a try
I couldn't find it anywhere so have rehosted it for you.

 

[MOMO11SpeedUK]

Well the firmware has been up for over six days so I hope that you've had chance to grab it.
I'm losing the ability to use space and bandwidth on that domain soon, so it might get taken down without warning.

 

[Snowywakey]

Lost patience with it, decided I'd bought a pile of pap and have sent it to the great recycler at my council tip.