Hi @joanxie ,
I tried to format SDcard with exfat and it is working through adb shell :
evk_8mm:/ # mkfs.exfat /dev/block/mmcblk1p1
mkexfatfs 1.3.0
Creating... done.
Flushing... done.
File system created successfully.
After executing these commands, I can see type=exfat.
BUT I need default format exfat without any commands through adb shell...