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I have a Raspberry Pi 3 b. I tried to boot it to android things OS. But when I connect the Pi to power, it is showing nothing except a rainbow colour screen and the green led is blinking 7 times. Please help me correct this issue?

migrated from superuser.com Dec 26 '18 at 11:31

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According to R-Pi Troubleshooting with 7 flashes of the green led the kernel.img is not found. I do not have any experience with android things but in general the Raspberry Pi boot loader expects its boot files including the kernel image on the first partition of the SD Card. This partition must be formated with the vat file system. So please check if this conditions are met. To compare, the boot partition of the official supported Raspbian Stretch Lite 2019-04-08 contains this files:

rpi ~$ ls /boot
bcm2708-rpi-0-w.dtb     bcm2710-rpi-3-b.dtb       config.txt                fixup_db.dat            kernel.img        start_db.elf
bcm2708-rpi-b.dtb       bcm2710-rpi-3-b-plus.dtb  COPYING.linux             fixup_x.dat             LICENCE.broadcom  start.elf
bcm2708-rpi-b-plus.dtb  bcm2710-rpi-cm3.dtb       custom-configuration.txt  initrd.img-4.14.98-v7+  LICENSE.oracle    start_x.elf
bcm2708-rpi-cm.dtb      bootcode.bin              fixup_cd.dat              issue.txt               overlays
bcm2709-rpi-2-b.dtb     cmdline.txt               fixup.dat                 kernel7.img             start_cd.elf

Further information about the boot process you can find at Boot flow.

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