FAT use ascii as default iocharset starting from 4.7.2-1, so we need
the nls_ascii kernel module else the kernel can't mount the partition
and mount the squashfs.
https://packages.qa.debian.org/l/linux/news/20160829T000024Z.html
manual_add_modules nls_cp437
manual_add_modules nls_iso8859-1
manual_add_modules nls_utf8
manual_add_modules nls_cp437
manual_add_modules nls_iso8859-1
manual_add_modules nls_utf8
+manual_add_modules nls_asci
manual_add_modules vfat
# Filesystem: ntfs
manual_add_modules vfat
# Filesystem: ntfs