diff --git a/config/sources/families/rk3399.conf b/config/sources/families/rk3399.conf
index 8b9f4fa32..fd15f21fe 100644
--- a/config/sources/families/rk3399.conf
+++ b/config/sources/families/rk3399.conf
@@ -68,12 +68,12 @@ fi
 
 write_uboot_platform()
 {
-	if [[ $BOOT_USE_MAINLINE_ATF == yes || $BOOT_USE_TPL_SPL_BLOB == yes ]]; then
+	if [[ -f $1/u-boot.itb ]]; then # $BOOT_USE_MAINLINE_ATF == yes || $BOOT_USE_TPL_SPL_BLOB == yes
 
 		dd if=$1/idbloader.img of=$2 seek=64 conv=notrunc status=none >/dev/null 2>&1
 		dd if=$1/u-boot.itb of=$2 seek=16384 conv=notrunc status=none >/dev/null 2>&1
 
-	elif [[ $BOOT_USE_BLOBS == yes ]] ; then
+	elif [[ -f $1/uboot.img ]]; then # $BOOT_USE_BLOBS == yes
 
 		dd if=$1/idbloader.bin of=$2 seek=64 conv=notrunc status=none >/dev/null 2>&1
 		dd if=$1/uboot.img of=$2 seek=16384 conv=notrunc status=none >/dev/null 2>&1