WeAct WCH CH582F bluetooth-low-energy (BLE) RISC-V board
About
A cheap chinese BLE board with a RISC-V core.
Price
Around 3EUR.
Reflashing
There are several tools to reflash it.
I tried to compile the Rust tool, but cargo tried to compile a whole bunch of other tools.
At the end, I had some success with a simple C program made by.
You have to press the BOOT button, and watch your USB bus every second:
$ watch -n1 lsusb