I have been using it for a some time https://forum.radxa.com/t/about-multiboot/2838/9?u=rua1
Having changed a little, I could have done everything on one device, but here I have to bother with the android. The first time it loads and expands the last partition to the entire disk. And if its section is not the last on the device, then it will not start. This is every time you record a new android, you must rewrite the entire device.