RO75 Driver & Firmware Support

 

Everything you need to customize your typing experience.

⚠️ READ BEFORE PROCEEDING

  • Wired Mode Only: You must connect the keyboard via the USB-C cable to configure keys or update firmware. VIA will NOT detect the keyboard in Bluetooth or 2.4G mode.
  • Unzip Files: Always unzip (extract) downloaded files before using them. VIA cannot read .zip files directly.
  • Firmware Risk: Do not update the firmware unless you are experiencing issues. Incorrect flashing may damage your PCB.
01. VIA Configuration (Remap Keys)

The RO75 supports VIA for real-time key remapping without installing software. Your settings are saved directly to the keyboard's onboard memory.

How to load the JSON file:

  1. Extract the file: Download the file above and unzip it to get the ro75_via.json file.
  2. Connect Cable: Switch the toggle on the back of the keyboard to "Cable" or "USB" mode.
  3. Open VIA: Go to usevia.app using Chrome or Edge browser.
  4. Enable Design Tab: Click the Settings (gear icon) on the top nav, and toggle on "Show Design tab".
  5. Load Draft: Click the Design (paintbrush icon) tab. Click "Load Draft Definition" and select your .json file.
  6. Configure: Click the Configure tab (keyboard icon). Your keyboard should now be recognized.
02. Firmware Update

Current Version: V1.0.5 (2025-08-11)
We support QMK Toolbox flashing methods for hex file format. Please check your file extension before proceeding.

 

Flashing Method : QMK Toolbox (For.hex)

Advanced method. Requires QMK Toolbox installed.

  1. Open QMK Toolbox. Check "Auto-Flash" for easier operation.
  2. Click "Open" and select your .hex  firmware file.
  3. Enter Bootloader: Unplug the cable. Hold down ESC and plug the cable back in.
  4. Flash:
    • If "Auto-Flash" is on, it will start automatically.
    • Otherwise, click the Flash button when you see the yellow text *** DFU device connected.
03. Frequently Asked Questions
Q: VIA is stuck on "Searching for devices..." A: Ensure you are in Wired Mode. Wireless protocols do not support VIA transmission. Also, check if you have loaded the JSON file in the Design tab correctly (Step 01).
Q: I get an "Object: should have required property" error in VIA. A: This usually happens if "Use V2 definitions" is not enabled in VIA settings for older JSON files. Try toggling that option in the Settings tab.
Q: My Bluetooth pairing was lost after updating firmware. A: This is normal. Flashing the firmware resets the EEPROM. Please delete the keyboard from your computer's Bluetooth list and re-pair it (Fn + 1/2/3).
Q: Does the keyboard support NKRO (N-Key Rollover)? A: Yes, but only in Wired (USB) Mode. In Bluetooth and 2.4G wireless modes, the keyboard defaults to 6-Key Rollover to save battery and ensure signal stability.
Q: I flashed the firmware but now my custom keys are gone? A: Flashing firmware usually resets the keyboard to factory settings. You will need to reload your VIA JSON file to restore your custom keymap.

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