HT-M02 web credentials reset

For some reason, the username/password combination I chose for the web admin interface is not working (nor the default credentials that I foolishly tried to change).

Is there any way to revert to the default credentials (for the web admin interface)? I can still access the OS via SSH. Gateway is working (with chirpstack) as intended, as far as I can tell.

problem solved via initialisation command (step 8 from the fimware update procedure)