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September 15, 2017, 10:46:21 PM |
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A factory reset often does not wipe the flash storage completely. It will format it, but the data is still there and could be theoretically retrieved. The only way to be sure that your private keys do not exist on the device are to delete the file and overwrite it with 0's or random data. Unfortunately that is a bit hard to do on a phone.
For most use cases, unless you think the person you are selling the phone to both a) has the expertise to perform data recovery on a phone and b) knows you had coins on the phone, it should be safe. Additionally, if your wallet has a passphrase on it and is encrypted, then your private keys should be safe.
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