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There are 3 places we have to deal with:
/data partition - contains user data, installed apps, settings, not directly accessible without root
/system partition
reader partition - the drive that is exposed via usb for media storage, also refered as internal sdcard, /mnt/sdcard
Sony hard reset will erase user data and format reader partition, but if system partition is broken, which can happen easily on a rooted device, it will not be fixed via hard reset.
sd recovery and restore set will completely restore data and system partition but will leave reader partition as it is.
So, to completely reset everything, you have to do both.
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