diff --git a/.config b/.config
index 8772ac2b41b73d90429f14326cc8484ed3f4591a..c229fa3c6a85fcd46a2197de5b4725a5bd6f6c25 100644
--- a/.config
+++ b/.config
@@ -33,6 +33,8 @@ __flash_device()
 
 	if [ "$1" = "ext" ]; then
 		run_adb root
+		sleep 1
+		run_adb wait-for-device
 		run_adb remount
 		run_adb shell rm -r /system/b2g/distribution/
 		run_adb shell rm -r /data/b2g/mozilla/*.default/startupCache