Cool [Q] i747 hotspot probs

I have a unlocked att i-747
i am running speedtalk aka tmobile

it is unlocked roooted using cf-autoflash with super user installed
and clockwork recovery

running
i747ucuemjb 4.3 android

my question is how do i change unlock the wifi hotspot
says no mobile data/ or invalid sim

also if i wanted to download the current rom for my device for cyanogenmod 11
would i just install with the recovery or how do i install that

Thanks

so much a disabled Iraqi War Vet