Ch341a - V 118

The 20-pin ZIF socket is wired to match the standard SPI pinout used in most desktop motherboard BIOS chips (Winbond, Macronix, Gigadevice). The CH341A v1.18 typically adds breakout headers next to the ZIF socket, labeled:

Used for flashing 25-series chips (BIOS, UEFI, firmware). ch341a v 118

Use a multimeter to measure the voltage between and the CLK pin or MOSI pin on the SPI side. The 20-pin ZIF socket is wired to match