diff --git a/mk_mmc.sh b/mk_mmc.sh
index 2583c5e..4872a32 100755
--- a/mk_mmc.sh
+++ b/mk_mmc.sh
@@ -1038,6 +1038,16 @@ function finish_installing_device {
 		chmod a+x /target/etc/finish-install.sh
 
 		if [ -f /etc/rcn.conf ]; then
+		        if [ -d /target/boot/uboot ] ; then
+		                sync
+		                umount /target/boot/uboot
+		        fi
+
+		        if [ -d /target/boot/ ] ; then
+		                sync
+		                umount /target/boot/
+		        fi
+
 		        mkdir -p /target/boot/uboot || true
 		        mount /dev/mmcblk0p1 /target/boot/uboot