I am planning to sell my phone Redmi Note 7 running Android 9 which is already unlocked bootloader but no root access, is my data can still be recovered through Android software recovery? I don't want the new owner to recovered my personal data. and I read somewhere that Android factory reset does not actually delete your file and still can be recovered. Is this safe to just only factory reset?
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Most likely what you have read is at least 3-5 years old and refers to older Android versions before all devices are mandatory encrypted by default. – Robert Jul 10 '21 at 10:25
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Android 9 has encryption by default. Factory reset clears encryption keys from TEE so recovered data cannot be decrypted. – defalt Jul 10 '21 at 11:03
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Possibly related: How to make a complete factory reset, without anyone being able to retrieve my data? – Andrew T. Jul 10 '21 at 12:10