Got an older dna250 board that refuses to skip the production charging test, and also refuses to pull more than .7a from the computer's USB port, so it never passes. Original programming date sept 2016, while my other 2017 boards skip the charging test fine.
Also as part of testing I put in SP9, which causes dna250s to bump to 1.100+v bandgap and fail production. Reverts to 1.02ish when i revert to SP5.