Ha! Success!
Code:
[root@frost root]# dosfsck -a -w /dev/mmcblk0p3
dosfsck 3.0.6, 04 Oct 2009, FAT32, LFN
There are differences between boot sector and its backup.
Differences: (offset:original/backup)
65:01/00
Not automatically fixing this.
/dev/mmcblk0p3: 16853 files, 612880/1764440 clusters
Code:
[root@frost root]# /usr/local/niluje/usbnet/sbin/fsck.fat -a -w /dev/mmcblk0p3
fsck.fat 4.1+git (2017-01-24)
0x41: Dirty bit is set. Fs was not properly unmounted and some data may be corrupt.
Automatically removing dirty bit.
/dev/mmcblk0p3: 16853 files, 612880/1764440 clusters