Teyleten Robot Digispark Kickstarter Development Review

Using this product, our team found that it was extremely slow and had trouble handling even basic tasks. The software was unreliable and often crashed....

You get what you pay for. These Attiny85 boards were Revain's cheapest offering. 2 out of 5 - DOA. most likely shorted out somewhere on the boards or the microcircuit failed. It's difficult to say. the other 3 work fine.