Sometimes the programming jig is not firmly pressed on the Blink and causes that error. I’ve found that the reason for programming failure is usually:
- Re-press (not too hard) jig on Blink so spring loaded pins make solid contact
- Blink battery too low (check voltage between screw and reset pin - should be at least 2.7v)
- Make sure USB connection working properly to PC/Mac so ISP is seen.