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I am exchanging my old phone with a new one. There is a lot of data on it (like banking apps) which must not end up in bad hands. I understand that I can still get some, if not all, files back after factory reset. So, I looked up play store to find a wipe app but there are many. With plenty of positive and negative reviews. I am not really sure which one to try out. Anyone here knows good app I could use?
If not, I will do it the hard way. (Factory reset -> Save junk files on entire phone storage -> Factory reset) * 3. This will take some time though.
Do bear in mind that this is solid state storage, and it's not like HDD - blocks are "rotated" to prevent them getting used too much, even if the OS believes it has the "same" physical block.
It is quite possible to erase eMMC with good "overwriters" and still retrieve the original data later.
I'd suggest an encrypt, hard reset, fill it up, encrypt, hard reset cycle if you are at all worried. And as an extra precaution, change all your passwords!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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I used in past an app named Super BackUp on PlayStore which can backup and sync the contacts, sms, apks installed on the android to your google drive and then you can sync back on new using this app from your google drive.