Is it possible to reset the PIN and phrase of a Trezor if it was set before?
Yes, possible as given the details on how-to. May we know what's the context behind that or you just want to wipe out the trezor that you have? Don't make a mistake doing that or you'll regret as long as you're guided and as said, there should be no funds anymore at that HW when you do the wiping out.