ok, the problem is (i think) the serial number. it shouldn’t have an underscore— i don’t recall the symptom. can you take a photo of the grid?

my suggestion is to download this: http://dangerousprototypes.com/blog/2010/01/27/pirate-rename-get-a-nicely-named-serial-device/

you’ll need to turn off the apple driver first:

sudo kextunload -bundle-id com.apple.driver.AppleUSBFTDI

then “read” the usb data. change the underscore to a zero.

then turn the driver back on:

sudo kextload -bundle-id com.apple.driver.AppleUSBFTDI

and maybe reboot