Decent Espresso

How to use USB-C to upgrade your HDS firmware (v3.0.0 and above)


1. Get the update ready

  • Download the firmware update and unzip (extract) the folder.
  • Inside that folder, you should see these four files:
    • bootloader.bin – starts up the device
    • partitions.bin – tells the device how to organize its memory
    • firmware.bin – the main software for the device
    • littlefs.bin – holds the web apps for Half Decent Scale

2. Connect your device

  • If using a Mac, make sure you have installed the required WCH CH34X drivers for macOS first.
  • If using a Windows PC, make sure you have installed the required WCH CH34X drivers for Windows first.
  • Use a USB-C cable to connect your HDS to your computer.
    • If your HDS display does not turn on or doesn't show the charging animation, do not worry. ESP Flash tool can still connect to it
  • Open Firefox or Chrome (other browsers may not work).
  • Go to the ESP Flash Tool page in your browser.

3. Set up the tool

  • In the Flash Tool, choose the highest baud rate available - 921600 Baud.
  • Click Connect.
  • From the list of devices, select wchusbserial.
  • The tool should now be connected to your HDS.
    • HDS display will turn off at this point


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4. Load the update files

  • For each of the four .bin files in the folder, choose it in the tool and enter the offset value shown in the video guide.
    • bootloader.bin: 0x0
    • partitions.bin: 0x8000
    • firmware.bin: 0x10000
    • littlefs.bin: 0x670000
  • Double-check that the offsets match correctly.

5. Start the update

  • Click Program.
  • Wait until the tool tells you it's finished.
  • When prompted, restart your HDS:
    • Turn it upside down.
    • Find the small round hole on the bottom right.
    • Push a paperclip (or SIM ejector tool) into the hole until you hear a click.

6. Confirm it worked

  • Once restarted, open the HDS Setup menu on your device.
  • Go to About → you should now see version 3.0.0.

✅ Done!



Updated 2025/09/27