Factory reset leaves some data behind
Data security after a factory reset depends on the type of device and the encryption method used. While the reset process deletes data from the device and restores it to its original state, it does not remove data from cloud servers unless you log out and disconnect associated accounts. Additionally, modern encrypted devices make it impossible to recover old data once encryption keys are deleted. However, some remnants of data may still remain on old storage units or external memory cards, which must be handled separately. Therefore, to ensure data protection when selling your phone, it is recommended to back up important information, log out of accounts, and remove the memory card before performing a factory reset.
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