I'm having the same problem here with the bootloader. I already tried other versions of bootloaders (stm32ld, stm32flash, stm32bootloader) and different drivers for the Prolific, it is always the same in my Mac with OSX 10.10. When I use the virtual machines in Linux or Windows it works. Do you continue with the same problem in your Mac? It must have to do with the driver, but I cant find one that works.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I'm having the same problem here with the bootloader. I already tried other versions of bootloaders (stm32ld, stm32flash, stm32bootloader) and different drivers for the Prolific, it is always the same in my Mac with OSX 10.10. When I use the virtual machines in Linux or Windows it works. Do you continue with the same problem in your Mac? It must have to do with the driver, but I cant find one that works.