diff --git a/ROMFS/px4fmu_common/init.d/666_fmu_quad_x550 b/ROMFS/px4fmu_common/init.d/666_fmu_quad_x550
new file mode 100644
index 0000000000..a7ffffaeec
--- /dev/null
+++ b/ROMFS/px4fmu_common/init.d/666_fmu_quad_x550
@@ -0,0 +1,116 @@
+#!nsh
+#
+# Flight startup script for PX4FMU with PWM outputs.
+#
+ 
+# disable USB and autostart
+set USB no
+set MODE custom
+ 
+echo "[init] doing PX4FMU Quad startup 666_fmu_quad_X550..."
+ 
+#
+# Start the ORB
+#
+uorb start
+ 
+#
+# Load microSD params
+#
+echo "[init] loading microSD params"
+param select /fs/microsd/params
+if [ -f /fs/microsd/params ]
+then
+	param load /fs/microsd/params
+fi
+
+#
+# Load default params for this platform
+#
+if param compare SYS_AUTOCONFIG 1
+then
+	# Set all params here, then disable autoconfig
+	param set MC_ATTRATE_P                0.14
+	param set MC_ATTRATE_I                0
+	param set MC_ATTRATE_D                0.006
+	param set MC_ATT_P                    5.5
+	param set MC_ATT_I                    0
+	param set MC_ATT_D                    0
+	param set MC_YAWPOS_D                 0
+	param set MC_YAWPOS_I                 0
+	param set MC_YAWPOS_P                 0.6
+	param set MC_YAWRATE_D                0
+	param set MC_YAWRATE_I                0
+	param set MC_YAWRATE_P                0.08
+	param set RC_SCALE_PITCH              1
+	param set RC_SCALE_ROLL               1
+	param set RC_SCALE_YAW                3
+
+	param set SYS_AUTOCONFIG 0
+	param save /fs/microsd/params
+fi
+
+#
+# Force some key parameters to sane values
+# MAV_TYPE     1 = fixed wing, 2 = quadrotor, 13 = hexarotor
+#              see https://pixhawk.ethz.ch/mavlink/
+#
+param set MAV_TYPE 2
+ 
+#
+# Start MAVLink
+#
+mavlink start -d /dev/ttyS0 -b 57600
+usleep 5000
+ 
+#
+# Start the sensors and test them.
+#
+sh /etc/init.d/rc.sensors
+ 
+#
+# Start the commander.
+#
+commander start
+
+#
+# Start GPS interface (depends on orb)
+#
+gps start
+ 
+#
+# Start the attitude estimator
+#
+attitude_estimator_ekf start
+#
+# Start the position estimator
+#
+position_estimator_inav start
+ 
+echo "[init] starting PWM output"
+fmu mode_pwm
+mixer load /dev/pwm_output /etc/mixers/FMU_quad_x.mix
+pwm -u 400 -m 0xff
+ 
+#
+# Start attitude control
+#
+multirotor_att_control start
+
+#
+# Start position control
+#
+multirotor_pos_control start
+
+#
+# Start logging
+#
+sdlog2 start -r 50 -a -b 14
+ 
+#
+# Start system state
+#
+if blinkm start
+then
+	blinkm systemstate
+fi