diff --git a/SD_ROOT/wz_mini/usr/bin/watch_up.sh b/SD_ROOT/wz_mini/usr/bin/watch_up.sh
index 929cfdb..ee61719 100755
--- a/SD_ROOT/wz_mini/usr/bin/watch_up.sh
+++ b/SD_ROOT/wz_mini/usr/bin/watch_up.sh
@@ -1,16 +1,19 @@
 #!/bin/sh
 
-LOG_NAME=/opt/wz_mini/log/watch_up
-if [[ -e $LOG_NAME.log || -L $LOG_NAME.log ]] ; then
-    i=0
-    while [[ -e $LOG_NAME.log.$i || -L $LOG_NAME.log.$i ]] ; do
-        let i++
-    done
-        mv $LOG_NAME.log $LOG_NAME.log.$i
-    LOG_NAME=$LOG_NAME
+DEBUG=false
+
+if [ "$DEBUG" == "true" ]; then
+
+	if [ -L /dev/fd ]; then
+		echo fd exists
+	else
+		echo fd does not exist, link
+		ln -s /proc/self/fd /dev/fd
+	fi
+
+	LOG_FILE=/opt/wz_mini/log/watch_up.log
+	exec > >(busybox tee -a ${LOG_FILE}) 2>&1
 fi
-touch -- "$LOG_NAME".log
-exec 1> $LOG_NAME.log 2>&1
 
 set -x
 
diff --git a/file.chk b/file.chk
index dfcfa7b..ffc7ed2 100644
--- a/file.chk
+++ b/file.chk
@@ -64,7 +64,7 @@ e2e7f9190edcfb31af42fb00c59919ab  SD_ROOT/wz_mini/usr/share/audio/upgrade_mode_v
 eaf86f91cb1b15b2191a8845ae88e3c8  SD_ROOT/wz_mini/usr/share/audio/init_v2.wav
 02fed0e4b2382d839f630ce0477aba26  SD_ROOT/wz_mini/usr/share/audio/init.wav
 2f055470bf862f8ddaf2a0c2d55fc46d  SD_ROOT/wz_mini/usr/bin/iCamera
-df71296985782eb0c111a95f36aa4648  SD_ROOT/wz_mini/usr/bin/watch_up.sh
+cf049b9446094cc8a7e07a33cf91c4a8  SD_ROOT/wz_mini/usr/bin/watch_up.sh
 b339aee882a5d1c943ad08e4282ec3fd  SD_ROOT/wz_mini/usr/bin/iCamera-dbg
 20b061689308b2cee7edf3b9b906bca7  SD_ROOT/wz_mini/usr/bin/ucamera
 69d727b25bbd22fb61f1cc0b5a063acb  SD_ROOT/wz_mini/usr/bin/upgrade-run.sh