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Just got it last night from LoneStar and I'm already working on the rom.
I'm not messing with tether, but here's the link to the guide if you want to do it yourself. You don't need a rom for tethering. Kuma wasn't the one that figured it out, it was Kevev.
Just follow the guide and also read through some of the posts...
(Working again)Howto: P769* ICS/JB T-Mobile Wifi tether upsell bypass *Root Required* - xda-developers