[HELP] iMEI Problem after flashed Stock ROM

i have an AQ4502 [Canvas A1]
after i go back to stock rom from CM13 now i cant access with NETWORK,
even flash any other ROMs,
my imei is not showing [*#06#]

i connect my phone to PC and its not showing my device [phone is just charging]

please help guys,
i bought my phone 8 days ago from Amazon.