75/35T (CH347) Flashing Guide

In this guide, we will guide you through flashing firmware on your 75T or 35T CH347 device.

Flashing should only be done on second PC. NOT the Gaming PC

Step 1. Connect to the JTAG Port

1. Locate the JTAG port on the DMA card.

   • This is the port closest to the motherboard.

2. Power down the main computer completely before making any changes:

   • Shut down the system.

   • Flip the power supply switch to the OFF position.

   • Press the power button on the case several times to discharge any remaining electrical energy from the capacitors.

3. Connect the JTAG cable securely between the JTAG port on the DMA card.

⚠️ Important: Never connect or disconnect the JTAG cable while the computer or card is powered. Doing so may damage the hardware or corrupt the firmware.

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Step 2. Download Flash Files

1. Download the required files from the link(s) below. > Flashing Driver: Download > Flashing Tool: Download

2. Save the files to a known location on your computer (e.g., C:\DMA_Flash_Files).

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Step 3. Install JTAG Drivers

1. Open the CH341PAR folder

2. Navigate to the SETUP.exe file.

3. Right-click and select Run as Administrator.

4. Click Install as shown in the installation prompt.

1. Open Device Manager and confirm that you see;

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Step 4. Launch FPGA Tool

1. Open the CH347-main folder.

2. Navigate to the FPGATool folder.

3. Right-click CH347FpgaDownloadTool and choose Run as Administrator.

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Step 5. Select the Correct Chip

1. In the FPGADownloadTool interface, change the first and second dropdowns to match the chip you are flashing:

   • xc7a35t → for 35T

   • xc7a75t → for 75T

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Step 6. Choose the Firmware File

1. Click the file selection field (highlighted in the image below, if available).

2. Navigate to and select your firmware file.

3. Ensure there are no spaces in the file path or directory name.

   • Example: C:\DMA_Flash_Files\firmware.bin ✅

   • Example: C:\DMA Flash Files\firmware.bin ❌

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Step 7. Begin Flashing

1. Click the Download button (highlighted below).

2. Allow the flashing process to complete — do not disconnect or power off during this time.

   ⚠️ Even if the progress bar reaches 100%, the flash may still be finalizing. Wait until you see the message:

   Info: Close the CH347

   before continuing.

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Step 8: Troubleshooting Flash Errors

If you encounter an error such as:

jtagspi_init_chain_id proxy_bit

or any similar error message:

1. Rename your firmware file to firmware.bin.

2. Move both the firmware file and the flash folder to the root of your C: drive.

   • Example: C:\firmware.bin and C:\flash\

Then retry the flashing process.

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Step 9: Power Cycle and Switch to Data Mode

1. After flashing completes successfully, power off your secondary PC, then power off your main PC.

2. Flip the power supply switch to OFF and press the power button a few times to drain residual power.

3. Switch the USB-C cable from JTAG to DATA.

4. Power on your main PC first, followed by your secondary PC.

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Step 10: Clean Up Old Firmware Files

• On your Main PC, remove any previous firmware traces.

• Download and run the Ghost Device Cleaner .bat file. (Ghost Device Cleaner)

• Follow the on-screen prompts to complete the clean up.