Modern versions typically support multiple target voltages (1.8V, 3.3V, and 5.0V).
+---------------------------+ | CH341A USB Programmer | | | | [25 SPI] [24 I2C] | +------------+ | +-------+ +-------+ | +------------------+ | Host |====>| | Top | | Bottom| |====>| Target IC / BIOS | | Computer | USB | | Half | | Half | | | (W25Q64, etc.) | +------------+ | +-------+ +-------+ | +------------------+ | ZIF Socket (16-Pin) | +---------------------------+
Click and save this binary ( .bin or .rom ) file in a safe location. Never skip this step , as it is your only safety net if the modification fails. Step 4: Erase and Program Click Open and select your new firmware file.
The default SPI clock is 1MHz. This is slow for 32MB BIOS chips (takes ~15 minutes). Use NeoProgrammer or ASProgrammer to adjust the speed. Increase to 6MHz for most chips. Note: v 1.18 hardware can handle up to 12MHz, but 6MHz is the stability sweet spot. ch341a v 118
Many counterfeit v 1.18 boards still output 3.8V on the "3.3V" pin, which can damage memory chips over time. Solder a 1N4148 diode in series with the VCC pin to drop the voltage to a safe 3.2V.
While the board provides a 3.3V power pin to feed the target flash chip, the CH341A data lines (MOSI, MISO, CLK, CS) often output . Modern 25-series BIOS chips are rated strictly for 1.7V to 3.6V. Feeding 5V down the data lines can overheat, degrade, or instantly kill the chip you are trying to program. How to Check Your v1.18 Board
Disclaimer: Always ensure you are legally allowed to flash the firmware on your device. Modifying BIOS may void warranties. Work in an ESD-safe environment to avoid damaging sensitive components. Step 4: Erase and Program Click Open and
Windows automatically installs a driver for the CH341A, but it is limited to COM port emulation. For low-level SPI access, you need the WinUSB driver. The tool is the standard solution: replace the default driver with libusb-win32 or WinUSB .
Obtain the CH341A USB Programmer Software v1.18 file (often in a .rar or .zip format).
However, the market saturation of fake v1.18 boards means you cannot simply search for "CH341A v1.18" and click Buy. You must: Use NeoProgrammer or ASProgrammer to adjust the speed
It natively supports standard 5V and 3.3V chips. With an external level-shifter adapter, it can also safely handle newer 1.8V low-power SPI chips found in modern laptops. Technical Specifications Core Chip: WCH CH341A (USB bus convert chip)
Installs the parallel/interface driver required for programmer software (AsProgrammer, NeoProgrammer).