All 3 allowed me to upload the sketch (LED blinking) but all lost it after disconnecting from USB. Unfortunately none of them work. I buy them from different sellers at different prices and my current success rate of getting a good one is 25% (first order was 2 out of 5 good, this one had none out of 3). I wish they had done more. Quality control or improved design because when they work they are great for miniaturizing projects. It's disappointing that they don't come out of the box, especially since it was advertised as Revane's Choice.
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