I’m taking over support for an office, and they have an RB951i-2HnD. The previous support person/company is not available. Is there any way to reset the password without losing it’s configuration?
I can connect via telnet and winbox, but unable to actually log into the device because of invalid credentials.
TIA
Password is part of the configuration, so for security purposes, you can’t reset only the password. This would allow anyone to access sensitive data.
It might be possible if you find an unencrypted backup of this RB somewhere.
Or if your RouterOS is between 6.29 and 6.43rc3, and you’d able to find a tool making use of this. 
I didn’t find it yet myself, but I didn’t look very hard. But it’s out there somewhere.