Using U-Boot to unbrick your KVM¶

If you bricked your KVM due to some DIY projects or flashing a wrong firmware, your KVM may not be able to power up properly. In this case, you can re-install the firmware by using U-Boot failsafe.

Preparation¶

Please prepare a computer or laptop with an Ethernet port. If your computer does not have an ethernet port, an additional USB-Ethernet adapter is required.

Unbrick steps¶

To avoid unbrick failure, please follow the steps below strictly.

Please download firmware here to your computer.
Remove the power of KVM. Connect your computer to the Ethernet port of the KVM.
Press and hold the Reset button firmly, at the same time power on your KVM.

Wait for the LED to flash in a regular sequence several times. Release the Reset button after the flashing pattern changes.
LED Flashing Patterns by Device Model
- Comet (GL-RM1): When holding the Reset button, the blue LED will flash 5 times. Release the Reset button after the 5 flashes, and the blue LED will remain solid.
- Comet PoE (GL-RM1PE): When holding the Reset button, the blue LED will flash 5 times. Release the Reset button after the 5 flashes, and the blue LED will remain solid.
- Comet Pro (GL-RM10): Hold the Reset button for about 5 seconds, during which power on your KVM at the same time, then release the button. It will enter the U-Boot mode.
- Comet 5G (GL-RM10RC): Hold the Reset button for about 5 seconds, during which power on your KVM at the same time, then release the button. It will enter the U-Boot mode.
Manually set the IP address of your computer to 192.168.1.2. Please check the step-by-step guide for different operating systems below.
Windows 7 / Windows 10
1. Go to Control Panel -> Network and Internet -> Network and Sharing Center -> Change adapter settings.
2. Right click Local Area Connection -> Properties.
3. Click Internet Protocol Version 4 (TCP/IPv4) -> Properties.
4. Set the IP adress to 192.168.1.2 manually.
5. Set the Subnet mask to 255.255.255.0.
6. Click the OK button.
Windows 11
1. Open Settings.
2. Click on Network & Internet.
3. Click the Ethernet tab.
4. Under the "IP assignment" section, click the Edit button.
5. Select the Manual option.
6. Turn on the IPv4 toggle switch.
7. Set the static IP address as 192.168.1.2.
8. Specify the Subnet mask as 255.255.255.0.
9. Click the Save button.
macOS
1. Click the Apple icon in the top left corner of the screen, and select System Preferences.
2. Click Network.
3. Click Ethernet on the left and then click the drop-down box next to Configure IPv4 and select Manually. If you are using a USB Ethernet Adapter, Ethernet may not be found and it may show up as the name of the USB Ethernet Adapter.
4. Enter the IPv4 Address to 192.168.1.2, Subnet Mask to 255.255.255.0, Router to 192.168.1.1, then click the Apply button in the lower right corner.
Use browser to visit http://192.168.1.1. This is the U-Boot Web UI.

Note: The U-Boot Web UI above may not be exactly the same as what you see, because the U-Boot version is different for different production dates. For security reasons, we currently do not provide separate U-Boot upgrades. If an update is necessary, we will integrate it into the new firmware.
Click Choose file and select the firmware file. Then click Update firmware button.
Wait for about 3 minutes. Do NOT power off your KVM when updating.

The KVM is ready when its LED is flashing white.
Revert the computer IP settings you did in step 4.
Unplug the Ethernet cable between your computer and the KVM, then connect your KVM to a network source (e.g. a router or a network switch) via this Ethernet cable or Wi-Fi.

Wait for about 1 minute to allow the KVM to obtain Internet access. You will then be able to access your KVM again.

Note: Configuration settings are typically retained. However, they will be reverted to default if a configuration error caused the system failure that required recovery.

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