This pin is used for USB programming, but its also an analog input known as Analog A3 GPIO #3 - this is connected to PB3 on the Attiny85. We didn’t want to keep these pins off the board but we strongly recommend not using them unless you’re sure you need them since you might have to disconnect any connections to reprogram the Trinket! The best use of these pins is as outputs to things like LEDs. That means that when the Trinket is connected to a computer and in bootloader mode or in the middle of uploading a new program, they are used for sending data to/from the computer! It’s possible to share these pins if you are careful.
The next 2 pins are also used for USB programming.
I also pulled hair out for a half a day while using a spare USB cable I had in the garage, turns out it came with a light and apparently did not have data cables inside the USB cable! Disconnect GPIO 2 I think it is, if it’s connected, it will never go into boot loader mode while that is connected, took me forever to figure that one out on mine.
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