I replied to someone last night on muffwiggler with a similar problem on a diy grids as well as a long pm chat.
There’s a known issue with avrdude 6.x and avrispmkii with libusb
Have look in the manual which describes a solution and also here:
I wonder if your problem is similar? (Unless it’s a soldering or driver issue)
Worth noting that diy mutable module discussion is not allowed on here.
If it is a factory grids, you could try the wav upload…