This is a latency issue. In Device Manager, open the Jaf COM port → Port Settings → Advanced → Set Latency Timer to 1 ms → Apply.
: Sites like DriverIdentifier and Driverscape host the flasher interface files for 64-bit systems. Jaf Box Driver For Windows 10 64 15
JAF (Just Another Flasher) Box users on Windows 10 64-bit , getting the driver to work is often tricky because it is legacy hardware originally designed for Windows XP or 7. Key Driver Details Official Hardware: JAF Flasher Interface by This is a latency issue