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This guide will show you how to install dual-boot CoreELEC on Xiaomi TV Box S (3rd Gen) without the need for additional cables or a PC (without ADB).
1. PREPARE XIAOMI TV BOX S (3RD GEN)
- Turn on Xiaomi TV Box S (3rd Gen). Go through the Google TV setup process until you get to the home screen. It is necessary to be signed into a Google account so you can access settings and complete the later stages.
- After the first CoreELEC boot the Xiaomi remote will not work. It can be enabled in CoreELEC Bluetooth settings (it needs to be paired), but on first boot you will either need a compatible CEC remote (it's likely your TV remote will work) or a USB mouse/keyboard.
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2. PREPARE COREELEC BOOTABLE USB FLASH DRIVE
- Download the latest CoreELEC build: https://relkai.coreelec.org/?dir=Amlogic-no/ce-22. Choose 'Amlogic-no.......Generic.img.gz'.
- Create a bootable USB flash drive of the downloaded image using Rufus (Windows) or similar image writing app (e.g. 'USB Image Writer' in Linux).
- Open the 'device_trees' folder of the CoreELEC USB drive you have just created.
- Locate the correct 'dtb' file. For Xiaomi TV Box S (3rd Gen) this is 's7d_s905x5m_xiaomi_3rd_gen.dtb'.
- Copy this file into the root of the USB drive and rename it to 'dtb.img':
3. INSTALL COREELEC
- On a PC/Mac, download 'Reboot_to_CoreELEC_5.0.apk' and copy to a USB flash drive. This can be any USB drive but it's convenient to use the CoreELEC one you just created. Download here: https://github.com/jamal2362/Reboot-to-CoreELEC/releases.
- Insert USB flash drive into Xiaomi TV Box S (3rd Gen). You should get a pop up asking what to do with the drive. Select 'USB' and then select the 'Reboot_to_CoreELEC_5.0.apk' file to install the apk.
- You may get a pop-up saying that 'Media Player not allowed to install unknown apps'. Go to settings and enable installation of unknown apps for the Media Player app.
- Install Reboot to CoreELEC. It will now appear in the home screen 'Your apps' section.
- Enable Developer Mode on the Xiaomi TV Box S (3rd Gen).
- Go to Quick Settings - All settings - System - About. Place cursor over 'Android TV OS build' and press remote OK button 7 times.
- A message will pop up at the bottom of the screen saying 'You are now a developer!'.
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- You will have a new menu item in the System menu, 'Developer options'.
- In 'Developer options' make sure 'Enable developer options', 'OEM unlocking' and 'USB debugging' are enabled.
- Insert the CoreELEC bootable USB flash drive you prepared earlier into Xiaomi TV Box S (3rd Gen).
- Run the 'Reboot to CoreELEC' app and select 'FIRST REBOOT'.
- Xiaomi TV Box S (3rd Gen) will reboot into CoreELEC and install CoreELEC to the USB flash drive.
- Your Xiaomi TV Box S (3rd Gen) will now boot into CoreELEC unless you remove the USB drive or select 'boot from eMMC' in the CoreELEC shutdown menu.
- After CoreELEC has been installed you can disable developer options in Android settings. This is recommended because when enabled it will disable the USB port for storage.
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