Service [q] gps do not work

hi ,guys:

DEVICE:NEXUS 7 ,1ST GEN 16G
SYSTEM:MIUI V6

PROBLEM:My device's gps doesnot work at all ,i tried flashed back to the PA /offical system / CM,which all are unworkble.

as nexus 7 is my car driving GPS too,

any one ,can help.

tks
Justin