If you have compiled a custom partition image and want to install it to your Mixtile Edge 2 Kit, you can follow this guide to install the partition image.
The installation process varies depending on the OS of your host computer:
This guide assumes that your Mixtile Edge 2 Kit runs Debian.
Prerequisites
Before you start, make sure you have:
- A host computer that runs macOS, Linux, or Windows.
- A Type-C cable.
- A compiled partition image.
Linux
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Install upgrade_tool_v2.22_for_linux and enter the Loader mode (see steps 1-4 in Installing an OS on a Linux distribution). 
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Install the partition image as needed (replace the image locations with the actual ones): upgrade_tool ul /path/to/MiniLoaderAll.bin # upgrade bootloader upgrade_tool di -p /path/to/parameter.txt # upgrade parameter upgrade_tool di -u /path/to/uboot.img upgrade_tool di -misc /path/to/misc.img upgrade_tool di -b /path/to/boot.img upgrade_tool di -recovery /path/to/recovery.img upgrade_tool di -oem /path/to/oem.img upgrade_tool di -rootfs rocdev/rootfs.img upgrade_tool di -userdata /path/to/userdata.img
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Once the installation is complete, reboot the device: upgrade_tool rd
macOS
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Install upgrade_tool_v2.13_for_mac and enter the Loader mode (see steps 1-4 in Installing an OS on macOS). 
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Install the partition image as needed (replace the image locations with the actual ones): ./upgrade_tool ul /path/to/MiniLoaderAll.bin # upgrade bootloader ./upgrade_tool di -p /path/to/parameter.txt # upgrade parameter ./upgrade_tool di -u /path/to/uboot.img ./upgrade_tool di -misc /path/to/misc.img ./upgrade_tool di -b /path/to/boot.img ./upgrade_tool di -recovery /path/to/recovery.img ./upgrade_tool di -oem /path/to/oem.img ./upgrade_tool di -rootfs rocdev/rootfs.img ./upgrade_tool di -userdata /path/to/userdata.img
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Once the installation is complete, reboot the device: ./upgrade_tool rd
Windows
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Install the DriverAssistant_v5.12 and RKDevTool_v3.19_for_windows, and enter the Loader mode (see steps 1-4 in Installing an OS on Windows). 
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On the Download Image page, click Dev Partition to read the partition information from Mixtile Edge 2 Kit:  Once the partitions are read, the partition addresses will be displayed in the Address column:  
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(Optional) If a partition is not displayed, add it manually: - 
Right-click a blank area and choose Add Item:  
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Click the blank cell of the partition and select the partition image:  
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Set its Name and Address manually. 
 
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Check the partition to burn, click the blank table cell on the right, and select the image file:  Example: installing UBoot:  
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Click Run to start the upgrade, and the device will restart automatically after the upgrade.  Note: If it fails to run, check the Write by Address box first and click Run again.