update docs

Author: cuav-chen2

docs/en/assembly/quick_start_cuav_x25_evo.md

@@ -10,6 +10,7 @@ This quick start guide shows how to power the [X25 EVO](../flight_controller/cua
 ::: info
 The following flight controller models are applicable to this quick start guide.
 [CUAV X25 SUPER](../flight_controller/cuav_x25-super.md)
+[CUAV X25 MEGA](../flight_controller/cuav_x25-mega.md)
 :::
 
 ## Wiring Chart Overview
@@ -151,3 +152,4 @@ QuadPlane-specific configuration is covered here: [QuadPlane VTOL Configuration]
 - [CUAV Docs](https://doc.cuav.net/) (CUAV)
 - [X25 EVO](../flight_controller/cuav_x25-evo.md) (PX4 Doc Overview page)
 - [X25 SUPER](../flight_controller/cuav_x25-super.md) (PX4 Doc Overview page)
+- [[X25 MEGA](../flight_controller/cuav_x25-mega.md)] (PX4 Doc Overview page)

docs/en/flight_controller/cuav_x25-mega.md

@@ -101,13 +101,34 @@ Order from [CUAV](https://store.cuav.net/).
 
 ## Assembly/Setup
 
-- Not provided.
+The [X25 MEGA Wiring Quick Start](../assembly/quick_start_cuav_x25_evo.md) provides instructions on how to assemble required/important peripherals including GPS, Power Module etc.
 
 ## Pinouts
 
 ![CUAV X25-MEGA Pinout_01](../../assets/flight_controller/cuav_x25-mega/x25-mega_pinouts_01.png)
 ![CUAV X25-MEGA Pinout_02](../../assets/flight_controller/cuav_x25-mega/x25-mega_pinouts_02.png)
 
+## PWM Outputs {#pwm_outputs}
+
+This flight controller supports up to 16 FMU PWM outputs (MAIN).
+
+Outputs:
+
+- Outputs 1-8 support [DShot](../peripherals/dshot.md).
+- Outputs 9-16 do not support DShot.
+- Outputs 1-7 support [Bidirectional DShot](../peripherals/dshot.md#bidirectional-dshot-telemetry).
+- Output 8 supports Bidirectional DShot output only (no eRPM capture).
+
+The 16 outputs are in 5 groups:
+
+- Outputs 1-4 in group1 (Timer5)
+- Outputs 5-8 in group2 (Timer4)
+- Outputs 9-11 in group3 (Timer1)
+- Outputs 12-14 in group4 (Timer8)
+- Outputs 15-16 in group5 (Timer12)
+
+All outputs within the same group must use the same output protocol and rate.
+
 ## Serial Port Mapping
 
 | UART   | Device     | Port          |