diff --git a/prebuilt/common/bin/backuptool.sh b/prebuilt/common/bin/backuptool.sh
index d716ec36..cd3107bf 100755
--- a/prebuilt/common/bin/backuptool.sh
+++ b/prebuilt/common/bin/backuptool.sh
@@ -18,7 +18,7 @@ check_prereq() {
 }
 
 check_installscript() {
-   if [ -f "/tmp/.installscript" ];
+   if [ -f "/tmp/.installscript" -a ! -f "$S/etc/force_backuptool" ];
    then
       echo "/tmp/.installscript found. Skipping backuptool."
       PROCEED=0;
@@ -70,6 +70,7 @@ lib/libspeech.so
 lib/libvoicesearch.so
 etc/hosts
 etc/custom_backup_list.txt
+etc/force_backuptool
 EOF
 }