Mantis: update bootloader and SYS_AUTOSTART

This adds a check for the previous SYS_AUTOSTART id. If it is still the
old/previous SYS_AUTOSTART id, it will flash the new bootloader as well
as set the proper SYS_AUTOSTART id.

boards/atl/mantis-edu/init/rc.board_defaults

@@ -22,3 +22,18 @@ set LOGGER_ARGS "-m mavlink"
 
 # Start esc
 tap_esc start -d /dev/ttyS4 -n 4
+
+# Transition from previous non open-source flight stack
+if param compare SYS_AUTOSTART 4001
+then
+	param reset_all
+	tune_control play -t 4
+	sleep 2
+	if bl_update /etc/extras/bootloader.bin
+	then
+		tune_control play -t 3
+	else
+		tune_control play -t 5
+	fi
+	sleep 2
+fi