Asprogrammer+21013

Download Zadig (version 2.8 or later). Ensure your CH341A is plugged in.

Why WinUSB? Unlike libusb, WinUSB has better timeout handling, directly solving the 21013 sync errors. asprogrammer+21013

Using a multimeter, measure between pin 4 (GND) and pin 8 (VCC) on your SOIC8 chip. You should see either 3.3V or 5V depending on your programmer’s jumper. If you see 0V, your clip is misaligned or your CH341A is dead. If you see 5V on a 3.3V chip, stop immediately—you may have damaged the chip. You need a 3.3V adapter board (or modify the CH341A by cutting the 5V trace). Download Zadig (version 2

When you search for "asprogrammer+21013", you are not looking for a software version. The number 21013 does not refer to a build number or a release date. Instead, it refers to a specific hardware identifier (USB VID/PID) or a common chip detection response code that appears in the ASProgrammer logs. Why WinUSB

In the context of CH341A programming, "21013" typically manifests in two ways: