🔁 If you see a yellow exclamation mark, disable driver signature enforcement (Windows 10/11) and retry.
This is where most people fail. Windows will automatically install a generic driver that sort of works but crashes frequently. neoprogrammer 21 019 ch341a install
Here is the fix:
Once done, your device should appear under "Universal Serial Bus devices" as WinUSB Device. 🔁 If you see a yellow exclamation mark,
Modern laptop BIOS chips use 1.8V logic. The CH341A is 5V/3.3V only. Use a level shifter (e.g., the black "CH341A 1.8V adapter"). In NeoProgrammer, go to Hardware → Voltage → 1.8V Mode. This prevents the software from sending 3.3V commands that would fry your chip. This is where most people fail