How to Install CoreELEC
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Download the latest CoreELEC build: https://relkai.coreelec.org/?dir=Amlogic-no/ce-22 → choose Amlogic-no Generic
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Create a bootable USB flash drive using Rufus
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On the USB drive, open the folder device_trees Copy the file: 7d_s905x5m_xiaomi_3rd_gen.dtb into the root of the drive and rename it to: dtb.img
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Insert the flash drive into the Mi Box (or USB hub if using USB-LAN)
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Enable Developer Mode on the Mi Box
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Connect via ADB and run: adb reboot update
After this, the device will boot into CoreELEC.