diff --git a/target/linux/ath79/image/common-senao.mk b/target/linux/ath79/image/common-senao.mk
index c9c14944c4..dda7da6776 100644
--- a/target/linux/ath79/image/common-senao.mk
+++ b/target/linux/ath79/image/common-senao.mk
@@ -1,6 +1,6 @@
 DEVICE_VARS += SENAO_IMGNAME
 
-# This needs to make /tmp/_sys/sysupgrade.tgz an empty file prior to
+# This needs to make OEM config archive 'sysupgrade.tgz' an empty file prior to OEM
 # sysupgrade, as otherwise it will implant the old configuration from
 # OEM firmware when writing rootfs from factory.bin
 # rootfs size and checksum is taken from a squashfs header
@@ -9,7 +9,9 @@ define Build/senao-tar-gz
 	-[ -f "$@" ] && \
 	mkdir -p $@.tmp && \
 	touch $@.tmp/failsafe.bin && \
+	touch $@.tmp/FWINFO-$(word 1,$(1))-$(REVISION) && \
 	echo '#!/bin/sh' > $@.tmp/before-upgrade.sh && \
+	echo ': > /tmp/sysupgrade.tgz' >> $@.tmp/before-upgrade.sh && \
 	echo ': > /tmp/_sys/sysupgrade.tgz' >> $@.tmp/before-upgrade.sh && \
 	echo -n $$(( $$(cat $@ | wc -c) / 4096 * 4096 )) > $@.len && \
 	dd if=$@ bs=$$(cat $@.len) count=1 | md5sum - | cut -d ' ' -f 1 > $@.md5 && \