I have a SIM908 GPRS/GPS shield attached to my Arduino UNO and i cannot upload my sketches. I keep getting this error: avrdude: stk500_getsync(): not in sync: resp=0x30
Just a guess without looking up the spec of the unit (hint, hint), but try uploading without the shield attached.
@joe-hoeller, please do not cross-post. Other thread deleted.