Factory Re-set is always an option.
Have you seen and used the ToneLib and Zoom Software?
I had a B1 Four and B1 XFour, but sold them for the older B1on and B1Xon, which only works with ToneLib.
Good thing is they can be USB powered - so a PowerBank or Phone Charger can do the do.
I Removed all the Factory Pre-sets,
And have Banks for a different main Sound, and Patches within the Bank for variations.
Great for Patch Per Song, Named and Stored via ToneLib and all saved on the phone!
Cracking bits of kit even now, at budget prices...