I don't see microsd

HI:
you can try it

Step 1:

mkdir bpi-boot

Step 2:

sudo mount /dev/mmcblk0p1 bpi-boot

Step 3:

sudo nano bpi-boot/bananapi/bpi-m3/linux/uEnv.txt

Step 4: (Modify uEnv.txt)

#script=script.bin
script=script.bin.emmc

Step 5: Reboot