Wont boot

I gave my phone to my brother and some how he managed to soft brick it and I'm trying to bring it back from the dead.

The device is S-On and has philz Touch on and is a ThreeUK device. I tried flashing the stock RUU through fastboot but it wont connect?

I'm not fussed what rom its running, I just need it running. Anyone have any suggestions?

thanks,

Ben