need help (burn to SD card debian8 $ debian9)

Hi everyone:

Two months ago. my friend gave a BBB(2G EMMC SYS:angstrom V2012) board to me.

I install debian8(Jessie ) into SD card,111.png,It’s running very well.

For some reasons,I cannot but change to debian 9(Stretch) 222.png…But when I burn to sd card ,BBB unable to start.

What should I do?

IMG LINK:https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#microSD.2FStandalone:_.28machinekit.29_Based_on_Debian_Stretch_with_4.14.x_rt_kernel_with_U-Boot_Overlays

6.1 is debian 8 6.2 is debian 9