I think the reset button acts differently before 08.0.70 build families. It might have erased only the password.
Put in a console cable and see if you can enable and then do a erase startup-config.
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If not, you can reboot it and at some point will be asked to press b to enter the boot monitor mode...
If you do that you can then enter
no password
boot
From there once it boots...
enable
erase startup-config