Frequently Asked Questions

Where can I find “getting started” guides?

These guides will be helpful for anyone learning how to use a Khadas SBC for the first-time.

Guides:

Tip: In addition to reading our documentation, you’ll find many helpful people on our Khadas Forum.

How to use an SD-card to expand eMMC storage?

Using Android OS, you can use SD-cards to augment the limited amount of storage on the eMMC. Make sure that you’re using a modern “high-speed” SD-card; something like a microSDXC UHS-I card will be suitable for this application.

Instructions:

  1. Insert your SD-card into your VIM or Edge SBC.
  2. Open the “Android-Settings” App (Gear Icon).
  3. Select “Storage & Reset”.
  4. Select your SD-card under “Removable Storage”.
  5. Select “Set up as device storage”.

Tip: If you’ve done the above steps correctly, your SD-card will become a seamless part of your SBC’s eMMC storage. Exercise caution when unplugging your SD-card as some files and photos will become inaccessible! Make sure that you use the OS to “eject” the card first, before removing it physically.

How to change/upgrade the Operating System?

Depending on your use-case, you may want to change/upgrade your Android OS to Ubuntu 18.04, or even run a custom dual-OS ROM. We refer to “operating system” files as “Firmware Images“, .img files, or ROMs. On our server, they are compressed into .7z containers, and will require WinRAR to unpack on Windows OS.

Tip: Changing operating systems will erase ALL the data on your eMMC. Unless the OS is meant to run from a Bootable SD-card (Booting Card), be sure to back-up all your data before following the instructions below.

VIM1/VIM2/VIM3 Upgrading Instructions:

  1. Place VIM into Upgrade Mode.
  2. Two ways to upgrade:

Edge Upgrading Instructions:

  1. Place Edge into Upgrade Mode.
  2. Two ways to upgrade:

eMMC image versus a SD/USB image?

eMMC image: An eMMC image should be burned directly to the eMMC using a USB-C data cable, from a Ubuntu or Windows Host. It must not be burned into an SD-Card. For Example: Android and Ubuntu distributions containing the EMMC mark.

SD/USB image: An SD/USB image should be copied into an SD-Card, before that card is then used to reformat the eMMC storage with a new OS. For Example: Armbian, Ubuntu distributions containing the SD_USB mark, as well as LibreELEC and CoreELEC.

How to bootup SD/USB images?

In order to bootup from SD/USB images, you need Android (V180209 or newer) or Ubuntu (V180531 or newer) running on your eMMC with Multi-Boot activated. Please refer to Boot From External Media for more information.

Help! My SBC won’t power-on!

Recommended VIM Power Supply

Although your VIM SBC is compatible with various types of power supplies, these are the recommended specs for the best performance-output and stability.

  1. 5V, 2A Power Adapter (USB 10W Adapter)
  2. USB-A to USB-C Cable

The VIM3 will require the USB-C 24W Adapter, and USB-C male-to-male cable, if you attach power hungry devices like the M2X Extension Board, or an NVMe SSD.

  1. USB-C 24W Adapter (5-20V USB Power Delivery)
  2. USB-C Cable (Male-to-Male)

Learn More:

Recommended Edge Power Supply

Although your Edge SBC is compatible with various types of power supplies, these are the recommended specs for the best performance-output and stability.

  1. USB-C 24W Adapter (5-20V USB Power Delivery)
  2. USB-C Cable (Male-to-Male)

Learn More:

My Bootloader is Damaged

Your SBC may also fail to power-on if the bootloader is damaged. In such cases, you’ll need to place your SBC into Upgrade Mode using the MRegister, and then re-install the Operating System.

Learn More:

Help! I turned on WOL, and now there’s this blue light?

vim2 blue light

If you’ve turned on Wake-On-LAN (WOL) in your VIM, it will no longer power-on automatically when you connect a USB-C cable to it. Instead, you’ll merely see a blue light activate indicating that there is electrical power being supplied to your SBC.

Furthermore, your VIM will only power-on under these conditions:

  1. You physically press the power button, after seeing the blue light.
  2. You send a magic packet to turn it on via LAN (Ethernet cable must be connected, and sending device must be on the same LAN as your VIM)

Learn More:

How to build my own Ubuntu/Debian images?

Please refer to: Build Ubuntu/Debian Images.

How to connect to Wi-Fi from the Linux Command Line?

Please refer to: Connecting to Wi-Fi from CLI

How to setup Bluetooth from the Linux Command Line?

Please refer to: Setup Bluetooth from CLI

How can I check my MAC address?

Please refer to: How to Use WOL.