Safe to sell used Android-phone without doing factory reset

I’ve got an Android One-unit with Android 10. However it refuses to boot and I’ve decided to get rid of it and I think I get get some money by selling a broken phone online. However since it refuses to boot I can not perform a factory reset or similair procedures. Is is safe to sell it or can personal data get in the wrong hands?

Some information:

  • I have not changed the encryption settings, so I think it’s encrypted by default
  • I got two factor authentication turned on on my Google account and removed the device from my “trusted devices”
  • I have screen-lock turned on with pattern needed to unlock it.

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Author: Cleared