Based on your description, here are two common issues and their solutions:

Issue 1: Only numbers can be entered when setting a PIN code.

• Cause: The option to input letters and symbols may not be enabled by default in the PIN code settings interface.

• Solution: In the PIN code settings interface, find and check the "Include letters and symbols" checkbox to set a complex PIN code that includes letters and symbols.

Issue 2: PIN code input has no effect at startup or system interface.

• Solution: First, please try using a commonly used numeric PIN code for verification. If you still cannot unlock after multiple attempts, please note: Computers usually support both PIN codes and user passwords for verification. If you have forgotten your PIN code, you can log in to the system using your previously set system user password.

Normally, the second monitor should work after plugging it in. If it fails to connect, it may be due to an incorrectly installed graphics card driver. You can try using the shortcut Win + P to switch display modes (such as duplicate or extended mode). The system may display a red error message indicating that no graphics card driver is currently available.

Please go to our official website to download and install the corresponding graphics card driver:
https://www.bosgame.com/pages/download-center

After the driver installation is complete, your dual-monitor display function should work normally. If you still have problems, please feel free to contact our technical support team for further assistance!

Thank you for your email. We understand the inconvenience your Bluetooth connectivity issue is causing. To help us pinpoint the problem, please confirm the following information:

1. Scope of the Problem

   • Is only this Bluetooth mouse unable to connect, or is your computer unable to recognize all Bluetooth devices (e.g., headphones, keyboards, mobile phones, etc.)?

   • If it's a problem with a single device, we suggest you try pairing this mouse with another computer or mobile phone to determine if the problem lies with the mouse itself.

2. Basic Troubleshooting Suggestions

   • Ensure your Bluetooth device has sufficient battery power and is in "discoverable" mode (usually activated by long-pressing the pairing button).

   • We recommend restarting your computer's Bluetooth function: turn Bluetooth off in system settings and then turn it back on.

3. Driver Solutions
   If you have confirmed that all Bluetooth devices are unrecognizable by your computer, the problem is likely a driver issue. Please visit the BOSGAME official support page to download and install a Bluetooth driver compatible with your computer model.

Official Driver Download Path: BOSGAME Official Website → Support → Enter Product Model → Select Operating System → Download Bluetooth Driver
(Official Website Link: https://www.bosgame.com/pages/download-center)

After installing the driver, please restart your computer and test the Bluetooth function again.

• This device does not have built-in speakers. For audio output, you will need to use a monitor with an audio output interface or external 2.0 channel speakers.

• If the speaker icon in the system tray displays a red "X", please check if your graphics card driver is fully installed.

• Have you tried switching the audio output source? You can do this via Settings > System > Sound > Select sound playback device.

• With the exception of the AI series, orders will be dispatched within 24 hours on working days; orders for the AI series will be dispatched within 48 hours on working days.

Our warranty service covers the following:
Hardware Failure Coverage

• Non-human-caused damage to original components such as motherboard, CPU, memory, and storage devices.

• Damage caused by abnormal power adapter output.

• Manufacturing defects (such as soldering problems/circuit board short circuits).

• Problems with the Wi-Fi network card.