diff --git a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
index e2bd946d29..e33b74a64e 100755
--- a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
@@ -773,8 +773,13 @@ platform_nand_pre_upgrade() {
 		local fw_mtd=$(find_mtd_part kernel)
 		fw_mtd="${fw_mtd/block/}"
 		[ -n "$fw_mtd" ] || return
+
+		local board_dir=$(tar tf "$1" | grep -m 1 '^sysupgrade-.*/$')
+		board_dir=${board_dir%/}
+		[ -n "$board_dir" ] || return
+
 		mtd erase kernel
-		tar xf "$1" sysupgrade-routerboard/kernel -O | nandwrite -o "$fw_mtd" -
+		tar xf "$1" ${board_dir}/kernel -O | nandwrite -o "$fw_mtd" -
 		;;
 	wi2a-ac200i)
 		case "$(fw_printenv -n dualPartition)" in