This is where things such as device MAC addresses of all radios that your phone uses in an encrypted format at the file system level storages. The EFS partition is a special partition that has been solely dedicated to a phone's information such as the radio signal, IMEI and a whole lot of other file types that surrounds the device's SIM card and other features such as Wifi and Bluetooth. The most frequent uses for these functions are downgrade to older firmware versions or upgrade to new ones. Updates software and mainly Writes restores and updates firmware.
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