Device not hard reseting

I have an htc desire 816 and it had an issue where google play shuts down as soon as I type a letter in the sign in screem, so I tried to factory reset it but as soon as it reboots to reset, it doesn't reset and instead it goes to fastboot screen, and when I try to choose factory reset from it it doesn't work either, so I can't reset it, how can I fix that?

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