My config is a Raspberry 3B so the native firmware of the 3.9.3A is the right one :-).
The FAT partition (/dev/mmcblk0p1) of the 3.9.3A image is corrupt so a linux fsck need to be done from the zeroshell prompt :
fsck /dev/mmcblk0p1 -V
A chkdsk with a Windows workstation should also works but i didn’t test this.