Hi there, I tried boot android from nvme driver(HP EX900 250gb) follow the guide https://wiki.radxa.com/Rockpi4/install/android-NVME.
I did everything step by step, burn the android booting SPI bin and img, but finally can not boot the android from the nvme.(The android version is rockpi-4b-rk3399-android9-20191122_1120_8df63ae-gpt)
The debian work fine. 
Please anyone help me~