Altering files directly on G1x Four?

[Roseweave]

I've been running into some strange issues with the device - particularly with some amps listed as "not found" when I pulled them over from the side - it seems like some weren't deleting properly so they likely didn't have space to fully upload. There was a phantom Acoustic 370 amp, I eventually managed to fix it but not sure how. Now I notice going through the files, there's a HOLDVERB_100 file from previous experiments a couple years back. How do I remove this file? It's not in the effects list.

is there a way to directly edit the files on the device?

[shooking]

There might be a better way but full reinit worked when I hit a similar issue.