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

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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.

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3. Set up the tool

In the Flash Tool, choose the highest baud rate available - 921600 Baud.

Click Connect.

From the list of devices, on macOS select wchusbserial, on Windows, select "USB Serial" .

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.

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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.

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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!