Teyleten Robot RP2040 Pro Micro Development Board Dual-Core 264KB 16MB USB-C Type-C for Micropython 3pcs

Bought these for a keyboard project. They perpetually connect in BOOT mode, which prevents them from actually running the keyboard software. I have other ones in identical form factors, and you're supposed to press BOOT + RESET to enter mood mode to flash, these are just always in BOOT mode. I inspected the board and compared to my others. This seems to use slightly larger SMD components than my other boards that work, and some of the soldering of these SMD components looks a bit haphazard. It's either a faulty board or a bridged trace somewhere. In any case, too bad, I was hoping these would work out.

I like the small form factor of these and the ones I got do have 16MB of memory. The boot and reset buttons are handy. 30AUG25 UPDATE: My boards work fine, but it looks like at least one of the other reviewers got a board missing alot of SMD components. There is no officially supported circuitpython build, you will have to use one that exposes all gpio pins. I am using the YCC-GND YD RP2040 build because I also have some of those boards, I confirmed all pins worked on mine by jumping each pin to ground and printing pin states to serial. If you get a good batch they work fine, and with how easy amazon returns are nowadays it might be worth the risk. Your mileage may vary though.

This is one of the boards that has HW-467AB printed on it's silkscreen. Those are defective and have a problem related to a capacitor and a resistor being swapped, causing problems using certain pins. Apparently some company decided to make those fast and didn't pay attention to the rp2040 schematic. Do not buy this one, find a different brand, make sure it doesn't has the HW number printed on it.

Defective product. GP26-29 do not work. Do not buy this product.

Did not work. Even simple “flash a led” programs did not work. Faulty!

defective. won't load firmware. stay away.

Just to concur with other reviews. Tried to use it for custom keyboard build, at least from the GPIO I need, 20-22-26-27 do not work. I’ll try the cap-resistance swap, without high hope. One of the board even had a bad soldering on the chip, 2 pins were shorted and the chip got really hot after being plugged for 3~4 seconds (I had not soldered anything to the board at that time). Really dangerous, and obviously no QC. Stay away! UPDATE: Looks like switching those 2 components (some even just removed them) did restore at least some of the functions, so far so good for me!