When working under Linux, the lsusb command can be a powerful diagnostic tool.
Connect the USB cable to your PC while still holding the button. Release the button after 3-5 seconds.
If it works, you see "Found One MSC Device" or "Loader" in the bottom status bar. If not, proceed.
On the computer side, try all USB ports, but prioritize the USB 2.0 ports. On the development board side, there is typically a designated . This is often a Type-C or a specific USB-A port. This port is critical and is the only one that can handle the low-level flashing protocol. Using the wrong port (e.g., a standard USB host port) will almost certainly result in a "no devices found" error. It is also essential to use a USB 2.0 A-to-A (male to male) cable for this connection. A USB 3.0 or standard phone charging cable may not work reliably. rkdevtool no devices found
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Virtual machine software (VMware, VirtualBox) that might automatically capture USB inputs. Summary Checklist
The official is the most reliable way to ensure your drivers are correct. Even if you think you have installed drivers, the safest approach is to uninstall any existing ones first. When working under Linux, the lsusb command can
Before giving up, run through this 60-second triage:
If you are still stuck, verify these three conditions are met simultaneously: Is the device in as "Rockusb Device"?
He switched back to RKDevTool. Still nothing. The silence of the office felt heavier. He knew the hardware was alive; a single green LED flickered on the board like a steady heartbeat. He reached for the Reset button, clicked it, and held the Boot key one more time. If it works, you see "Found One MSC
You may need to restart Windows in "Disable Driver Signature Enforcement" mode.
You need a Linux live USB (Ubuntu) to fix this:
Use lsusb in the terminal. If the connection is working properly, you should see an entry similar to Bus 003 Device 015: ID 2207:330c .
Ensure you aren't using a "charge-only" cable.