diff --git a/target/linux/sunxi/base-files/lib/upgrade/platform.sh b/target/linux/sunxi/base-files/lib/upgrade/platform.sh
index f2cd970d42..776bdf53bf 100644
--- a/target/linux/sunxi/base-files/lib/upgrade/platform.sh
+++ b/target/linux/sunxi/base-files/lib/upgrade/platform.sh
@@ -43,7 +43,7 @@ platform_do_upgrade() {
 			fi
 
 			#write uboot image
-			get_image "$@" | dd of="$diskdev" bs=1024 skip=8 seek=8 conv=notrunc
+			get_image "$@" | dd of="$diskdev" bs=1024 skip=8 seek=8 count=1016 conv=fsync
 			#iterate over each partition from the image and write it to the boot disk
 			while read part start size; do
 				part="$(($part - 2))"