diff --git a/flash_all.sh b/flash_all.sh
new file mode 100755
index 0000000..b76ba5b
--- /dev/null
+++ b/flash_all.sh
@@ -0,0 +1,11 @@
+#!/bin/bash -e
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+cd $DIR
+
+fastboot format userdata
+./flash_bootloader.sh
+./flash_kernel.sh
+./flash_system.sh
+
+fastboot continue
diff --git a/userspace/usr/comma/brightnessd.py b/userspace/usr/comma/brightnessd.py
index 1b7c72c..fee3197 100755
--- a/userspace/usr/comma/brightnessd.py
+++ b/userspace/usr/comma/brightnessd.py
@@ -34,7 +34,7 @@ if __name__ == "__main__":
         last_off_ts = time.monotonic()
 
       # calculate new max
-      uptime_hours = (time.monotonic() - last_off_ts) / 60*60
+      uptime_hours = (time.monotonic() - last_off_ts) / (60*60)
       clipped_perc = MAX_PERCENT - (HOURLY_PERC_DECREASE*uptime_hours)
       clipped_perc = int(max(min(clipped_perc, MAX_PERCENT), MIN_PERCENT))