Document version: 1.0 Last updated: 2026-04-18 Applicable to: Jr. Programmer v2 (CH341-based models)
Since these drivers lack a digital signature, standard installation will usually fail unless you Disable Driver Signature Enforcement Enter Advanced Startup Advanced Startup Restart Now Disable Signature Enforcement : Navigate through Troubleshoot Advanced Options Startup Settings . When the list appears, press (or 7) to select "Disable driver signature enforcement". Connect Hardware : Once Windows reboots, plug in your JR Programmer via a cable (not Micro USB). Update in Device Manager Right-click the Windows flag and open Device Manager drivers jr programmer v2 install