For the "Blackview BL9000 Pro" smartphone, here are some key points to help you understand its usage and features:

## Operating System and Interface
- The smartphone runs on Android 14 with the Doke-OS 4.0 interface.

## Display and Screen
- The device features a 6.78-inch IPS LCD screen with a 120Hz refresh rate and a resolution of 1080 x 2460 pixels. The screen is protected by Corning Gorilla Glass Victus.

## Cameras
- The main camera setup includes a 50MP primary sensor, a 13MP ultra-wide-angle lens, and a FLIR thermal camera. The front camera is a 50MP sensor.

## Performance
- The phone is powered by a MediaTek Dimensity 8020 chipset, an octa-core processor, and comes with 12 GB of RAM and 512 GB of internal storage.

## Durability and Resistance
- The device is IP68, IP69K, and MIL-STD-810H certified, making it dust and water resistant up to 1.5 meters for 30 minutes.

## Battery and Charging
- It has an 8800mAh non-removable battery with 120W fast charging and 5W reverse wired charging capabilities.

## Connectivity and Sensors
- The phone supports dual SIM (Nano-SIM), Wi-Fi 802.11 a/b/g/n/ac/6, Bluetooth 5.1, NFC, GPS, GLONASS, BDS, and GALILEO. It also includes sensors such as a fingerprint reader, accelerometer, gyroscope, proximity, and compass.

## Additional Features
- The device includes stereo speakers by Harman Kardon, FM radio, and USB Type-C for data transfer and charging. It also supports various audio and video formats.

### User Manual
For a detailed user manual, you can typically find it in the following places:
- Included in the box with the phone as a physical copy or on a CD.
- Available for download from the manufacturer's official website.
- Accessible through the phone's settings or support app.

Here are some steps to get started:
1. Initial Setup: Follow the on-screen instructions to set up your phone, including selecting your language, connecting to Wi-Fi, and setting up your SIM card.
2. Exploring the Interface: Familiarize yourself with the Android 14 and Doke-OS 4.0 interface, including how to navigate menus, use apps, and customize settings.
3. Camera Usage: Use the camera app to explore the various camera modes, including the thermal imaging feature.
4. Battery and Charging: Understand how to charge your phone and manage battery life.
5. Connectivity: Set up your Wi-Fi, Bluetooth, and other connectivity options.

For more detailed instructions, refer to the user manual or the manufacturer's support website.