Problem with admin password

Hello

We have a mikrotik that hacked and hacker changes password to òÔãË7×ÉÔÞ#@!
now we can’t login with winbox or ssh or telnet i think because password encoding

How we can resolve this problem?

thankyou

Reset the device and reconfigure it (or import from configuration backup).

I never tested this with password, but in other fields RouterOS stores whatever byte values it gets. What exactly it is depends on used encoding. So if you set Windows single-byte encoding to the same one as hacker had, you should get in (and if what you have is really the correct password, of course).