5 PCS ST-Link V2 Emulator Downloader Programmer Support Programming Unit STM8 STM32 (Random Color)

I had to update the firmware on them which STMCubeIDE 1.7 informed of automatically. Update can be the tiniest bit confusing but just try unplugging them and clicking update again and it should work if cube ide gives a dfu error. overall very happy with purchase and price! Im using these on STM32 blue and black pills without any issues. Just make sure to enable serial wire debugger if you want to debug

I bought these just to see if they would work. They all worked with the open source stlink software and with the official STM32 Cube Programmer.However! I don't exactly know what's wrong, but they are not able to handle 'connect under reset'. As a result, if you are using the programming pins as GPIO it will not work anymore after you first program the target chip.I do not recommend these for any serious development work.

The device works fine. I already had STM drivers installed and Windows identified it as a "STM32 STLink" USB device (VID_0483 PID_3748). It communicates well with some STM32 boards I have.The case is made of plastic. It is injection-molded (albeit of average quality) and you can slide it off. Inside is a 216MHz Cortex-M4 MCU MH2103A, a clone of STM32F103A.

They all flashed up using STM32 ST-LINK utility. I tried one with openocd and gdb-multiarch and that seem to work perfectly. I also tried st-flash, and st-info and both ran fine.They are not STM based, but Geely.

1 out of 5 was defective, so all in all still an decent deal cost-wise (about $5 each for the 4 good ones). But I can't give more than 3 stars due to the broken one.The units came with firmware V2J29S7 installed (what's with the weird version numbers, ST?). I didn't try flashing or debugging with the installed firmware - the ST utility took a long time just to print out the serial number/firmware revision. Firmware updates worked smoothly, bringing them to V2J40S7. With that firmware installed, the devices responded quickly and were able to flash my project perfectly.Pay attention to the pin out diagram - it's different than what is often posted on the Internet. Apparently there are at least two pin outs (maybe more) commonly used with ST-LINK clones.It should be no surprise that the microcontroller used on the device isn't an STM32 like on genuine ST-LINKs. It's a "Geehy" (which I've never heard of before) APM32F103C8T6.I plan to use these to give to non-developers who might need to flash the project for testing, etc. Flashing will be handled by a script, so as long as that works I'll be happy. If you're doing serious development & debugging, I'd suggest getting a genuine ST-LINK/V2 which are around $20 - when they're in stock (which, like today, is often not the case given supply chain shortages now). Those things are rock solid and work great.Bottom line is that these seem to be a good value even with a 20% failure rate - will buy again if I need more.

Worked well for programming the STM processors I have.

Works. Firmware update finally a succeed.