Ch341a — V 118

On , look for a 3-pin jumper named "3.3V / 5V". In some revisions, this jumper only changes the VCC voltage fed to the ZIF socket pin 20. The logic signals on pins 1-19 remain at 5V unless the board includes level shifters.

Plug the CH341A v1.18 into a USB 2.0 port. Avoid USB 3.0 ports, as they occasionally cause timing issues with older programming software. Step 4: Detect and Backup

: The Zero Insertion Force (ZIF) socket is divided into two parts: 24 Series : Positioned toward the lever side. 25 Series : Positioned away from the lever side. LED Indicators :

It can also function as a serial port for debugging other hardware. Key Features of Modern Revisions (v1.18+) ch341a v 118

A critical warning regarding the CH341A: Many modern laptops and MacBooks use chips that operate at . The standard cheap CH341A programmers output 3.3V or 5V . Connecting a 1.8V chip to a 5V programmer can instantly destroy the chip or the motherboard. Users working on newer hardware should use a programmer specifically designed for 1.8V logic or an adapter board with voltage regulators.

Ensure you installed the CH341PAR.SYS driver rather than the CH341SER.SYS driver. The "SER" driver forces the programmer into Serial COM port mode, which will not work for SPI flashing.

Today, many CH341A programmers purchased from reputable sellers come . Some advanced versions even include physical jumpers to switch between 1.8V, 3.3V, and 5V operation. For 1.8V chips (common in modern laptops), a separate 1.8V adapter board is required, which is inserted between the programmer's ZIF socket and the flash chip itself. On , look for a 3-pin jumper named "3

The original reference design by Qinheng was intended for 5V logic. However, most modern Flash chips operate at 3.3V. Feeding a 3.3V chip with 5V logic levels is a fast track to permanent damage. This is where board revisions—specifically v1.18—enter the scene.

Assuming you have performed the 3.3V mod.

Used for flashing 24-series chips (EEPROMs in TVs, monitors, RAM SPD). Common Use Cases Plug the CH341A v1

Using a 5V programmer on a 3.3V chip can damage the chip or the motherboard, though many modern chips are durable enough to survive.

Regardless of the software you choose, the basic workflow for recovering a bricked BIOS is the same.