Ordered 3 packs. The first time I tried to flash the firmware via the USB port (communication timeout). I thought I was until I tried one of the other two - and they blinked just fine. I was able to flash the bad one by connecting it directly to the Rx/Tx pins. Turns out the USB/Serial chip (CH340G) was receiving data from the USB port but couldn't transmit it, so there was no handshake or flash. Stupid luck I tried the bad one first. spent a lot of time trying to figure it out.
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