Strictly speaking, there is no official IC called the "CH21013." This is almost always a for the CH341A .
AsProgrammer 2.1.0.13: The Ultimate Guide to CH341A and UsbAsp Flash Programming asprogrammer+21013
: To flash a new file, follow these steps in order: Open File : Load your new .bin or .hex file. Strictly speaking, there is no official IC called
If you are using a standard CH341A USB programmer, ensure the drivers are installed. The repository often includes CH341PAR.EXE or you can use the standard USB-to-serial drivers. 3. Hardware Precautions asprogrammer+21013