If you want to reuse other platform(U3/XU/C1) OS installed eMMC,
You can use this tool.
In fact, this tool will install the Android OS including a boot blob in the hidden boot sector of the eMMC.
Before starting, remove everything attached to the board.
The only accept peripheral connected is the UART Kit. Everything else should be disconnected.
1. Download this file.
Download this latest Alpha 6.8 file ->
https://dn.odroid.com/5422/ODROID-XU4/A ... 21.img.zip
or from this mirror:
https://www.odroid.in/mirror/dn.odroid. ... 21.img.zip
2. Flash to a microSD card using Etcher -> https://wiki.odroid.com/troubleshooting ... s#flashing
3. Connect both the eMMC and MicroSD to XU3/XU4
4. Set the dip-switches(or slide-switch) near the ethernet Jack to "SD boot mode" (Make sure CCI is ON)
XU4 doesn't have the dip-switch. Just set the slide switch.
5. Connect Power and watch the LED status.
6. The blue and red LEDs are solid on.
This may take 40seconds ~ 3minutes.
After recovery process, the blue LED will be off.
And remove the power supply.
7. Set the dip switches back to eMMC boot mode.
8. Remove the microSD card
9. Proceed with normal power up with your peripherals attached.
This picture shows the eMMC boot mode. "ON-ON" for XU3/XU3-Lite.
SD boot mode. "OFF-ON"
XU4 has only simple slide-switch to select a boot source.
If the Android OS boots successfully, you can install other Linux OS images on the eMMC later.