Answered
reset beam
Factory reset Sonos beam
What do you want to know. Factory reset is not recommended unless you are selling or bringing in a 2nd hand device onto your system.
If you do need to reset then follow the Sonos guidance.
https://support.sonos.com/en-gb/article/reset-your-sonos-product
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.