Xiuxin 2pcs ESP32s Development Board 2.4GHz Dual-Mode WiFi + Bluetooth Dual Cores Module for Arduino IDE,Work with Amazon Alexa

I had a heck of a time getting this unit to take a write. For some reason simply putting the unit into write mode would not allow it to take new programming. After a bunch of fiddling (and almost returning these) I discovered that if you put the boards into write mode first, then start writing a new sketch, and then press the boot button WHILE arduino ide/mongoose/etc is trying to connect, then the IDE will connect and start slashing the board. Also to note, this only seemed to be a problem on my windows computer. When I tried writing the board from Arduino IDE on Linux, simply putting the board into write mode seemed to work as expected. (I have no idea why) One more note, I could not get these boards to be recognized USB devices on Mac at all. Apparently there is a known driver signing issue between the driver for these, and Mac's running OS X 10.13 or higher, that to-date, has yet to be fixed. I tried every recommendation I could find online, nothing worked, so if you want to program these boards with a Mac, I would look at some other kind of board or imaging computer.

So I bought a pare of these here and a different pair from another manufacture. Luckily the others worked and made me realize that these just suck. Like the other comments they are a pain to get it into the programming mode. If you do, it seems to act like it is flashing, but upon reboot the old application is still running ?? Not sure what the deal is, but I will for sure not by from here again! Don't waste your money here, buy better. The ones from HiLetgo worked great!

Both dev boards seem to work great. They came in ESD packaging with protective sponges for the pins. The manufacturing quality seems very good. I'm able to see the small pin labels on the board. I did notice that it will occasionally hang for 5-10 seconds when trying to upload from Arduino IDE. It gets stuck at "Connecting........_____....._____....._____....._____....._____....._____..". Sometimes I have to hit the "boot" button force it to load the program. My first impressions are 5 stars.

Board will not program via Arduino IDE:"esptool.py v2.3.1Connecting........_____....._____....._____....._____....._____....._____....._____....._____....._____.....____An error occurred while uploading the sketch"It ONLY works if you click BOOT button repeatedly. NO other ESP-32 I own does this.

Hard to program. You generally have to monkey with the BOOT button during a flash attempt to get it to work, but usually it then will. I'm set up as ESP32->Node32s in the IDE.