Need Help to Downgrade PRI version
 

ok yesterday my phone is can't make a call and send text message....
i try to reflash and upgrade but no change.....
maybe i have to downgrade the PRI version 2.20_003.from stock rom 6.5 to PRI 1.40_003 from stock rom 6.1 how to do that...i've try to downgrade the stock rom but the PRI version not change....how to Change the PRI Version...please need help......