Stps web flasher
Flash firmware onto the J&OT Stps eurorack module over USB — nothing to install.
This browser can’t talk to USB devices.
WebUSB is required — use Chrome, Edge, or another Chromium-based
browser. Firefox and Safari won’t work.
1Put the module in bootloader mode
- Connect a USB cable between the module and this computer.
- Hold the BOOT button — one of the two hidden tactile buttons on the module’s PCB.
- While holding it, power the module on (or tap the other hidden button, RESET). Then release.
2Pick a firmware
3Flash
Troubleshooting
- Nothing in the device picker: the module isn’t
in bootloader mode — redo step 1. The picker only lists devices
that identify as
STM32 BOOTLOADER. - Windows — device shows an error or never appears: the bootloader needs the generic WinUSB driver. Run Zadig once, pick STM32 BOOTLOADER, install WinUSB. (If STM32CubeProgrammer installed its own driver, replace it the same way.)
- Linux — “Access denied”: your user
needs permission for the device. Quick fix:
sudo chmod a+rw /dev/bus/usb/<bus>/<dev>, or add a udev rule for0483:df11. - Flash succeeded but the module seems dead: tap the hidden RESET button or power-cycle. If you were holding BOOT the whole time it re-entered the bootloader.