Legitimate use cases (only for your own device):
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On many devices, this is done by dialing *#*#717717#*#* or using ADB commands while rooted. Legitimate use cases (only for your own device):
. This typically happens after a bad firmware flash or a failed software update that corrupts the device's EFS partition , which stores vital network calibration data. The Story: Restoring the Signal Imei Qcn Tool Download