1. Introduction
This manual provides essential information for setting up, operating, and maintaining your BLU Bold K12 smartphone. Please read it thoroughly to ensure proper use and to maximize your device's capabilities.
Box Contents
The BLU Bold K12 package includes the following items:
- BLU Bold K12 Smartphone
- Rugged Case
- Glass Screen Protector
- Charger
- Type-C Cable
- Quick Guide
- Headphones
- SIM Key
- Sticker

Image: All items included in the BLU Bold K12 retail packaging.
2. Device Overview
Familiarize yourself with the physical components and design of your BLU Bold K12 smartphone.

Image: Front and rear view of the BLU Bold K12 smartphone.

Image: The BLU Bold K12 smartphone comfortably held in a user's hand.

Image: The BLU Bold K12 with its display and rear design.
3. Setup
3.1 Inserting the SIM Card
- Locate the SIM card tray on the side of your device.
- Insert the provided SIM key into the small hole next to the tray to eject it.
- Place your Nano-SIM card(s) into the tray with the gold contacts facing down, ensuring proper orientation.
- Carefully reinsert the tray into the phone until it clicks into place.
Note: The BLU Bold K12 is GSM unlocked and compatible with T-Mobile, Metro, Mint Mobile, AT&T, and Cricket. It is not compatible with Verizon Network. Please check with your carrier for network compatibility.
3.2 Initial Power On and Configuration
- Press and hold the Power button (located on the side) until the BLU logo appears.
- Follow the on-screen prompts to select your language, connect to a Wi-Fi network, and set up your Google account.
- Configure security features such as a PIN, pattern, or fingerprint.
4. Operating Instructions
4.1 Display and Navigation
The BLU Bold K12 features a 6.8-inch HD+ 120Hz Infinity Display with a resolution of 720 x 1600 pixels (258ppi). Navigate the interface using touch gestures: tap, swipe, pinch-to-zoom.
4.2 Camera Usage
Capture moments with the dual 50MP main camera, equipped with flash, and take clear selfies or make video calls with the 8MP front camera. The main camera supports video capture at 1080p@30fps.

Image: The dual camera system of the BLU Bold K12.
4.3 Battery Management
The device is powered by a 5,000mAh battery. To optimize battery life:
- Adjust screen brightness.
- Close unused applications.
- Enable battery saver mode when needed.

Image: 5000mAh Battery Icon.
4.4 Performance and Storage
The BLU Bold K12 is equipped with a Unisoc T7255 Octa-Core processor (ARM Cortex-A75, 2.0GHz) and 12GB RAM for smooth multitasking. It includes 128GB of internal storage, expandable via a MicroSD card slot.

Image: The K12's performance capabilities for various tasks.
4.5 Security Features
Unlock your phone quickly and securely using the side-mounted fingerprint sensor. You can also set up a PIN, pattern, or password for additional security.

Image: Side-mounted fingerprint sensor icon.
4.6 Operating System
The BLU Bold K12 runs on Android 15, providing a user-friendly interface and access to a wide range of applications through the Google Play Store.

Image: Android 15 icon.
5. Maintenance
5.1 General Care
- Avoid exposing your phone to extreme temperatures, direct sunlight, or liquids.
- Use the provided rugged case and glass screen protector for enhanced protection.
- Do not attempt to disassemble the device, as this will void the warranty.
5.2 Cleaning
To clean your phone, gently wipe it with a soft, lint-free cloth. Avoid using harsh chemicals or abrasive materials.
5.3 Software Updates
Periodically check for and install software updates to ensure your device has the latest features, security patches, and performance improvements. You can usually find this option in your phone's Settings menu under "System" or "About phone."
6. Troubleshooting
If you encounter issues with your BLU Bold K12, refer to the following common solutions:
6.1 Device Not Powering On
- Ensure the battery is charged. Connect the phone to the charger and wait a few minutes before attempting to power it on.
- Press and hold the Power button for at least 10-15 seconds to perform a forced restart.
6.2 Network Connectivity Issues
- Check if your SIM card is properly inserted.
- Verify that your device is within network coverage.
- Restart the phone.
- Go to Settings > Network & internet > Mobile network and ensure mobile data is enabled.
6.3 Applications Crashing or Freezing
- Close and reopen the problematic application.
- Clear the app's cache and data in Settings > Apps.
- Ensure the app is updated to its latest version.
- Restart your phone.
6.4 Factory Reset
If persistent issues occur, a factory reset may be necessary. Warning: This will erase all data on your phone. Back up important data before proceeding. To perform a factory reset, go to Settings > System > Reset options > Erase all data (factory reset).
7. Specifications
Detailed technical specifications for the BLU Bold K12 smartphone:

Image: Key specifications of the BLU Bold K12.
| Feature | Specification |
|---|---|
| Brand | BLU |
| Model Name | K12 |
| Operating System | Android 15 |
| Display | 6.8" HD+ 120Hz Infinity Display (720 x 1600, 258ppi) |
| Processor | Unisoc T7255, 2.0GHz Octa-Core (ARM Cortex-A75) |
| Memory (RAM) | 12 GB |
| Internal Storage | 128 GB |
| Expandable Storage | MicroSD Slot |
| Main Camera | Dual 50MP with Flash |
| Selfie Camera | 8MP |
| Video Capture | 1080p@30fps |
| Battery Capacity | 5000 mAh |
| Security | Side-Mounted Fingerprint Sensor |
| Cellular Technology | 4G (GSM Unlocked) |
| Connector Type | USB Type C |
| Color | Black Blue |
| UPC | 848958044703 |
8. Warranty and Support
8.1 Warranty Information
The BLU Bold K12 comes with a 1-year limited US Warranty. Please retain your proof of purchase for warranty claims. For detailed terms and conditions, refer to the warranty card included in your product packaging or visit the official BLU Products website.
8.2 Customer Support
For technical assistance, troubleshooting not covered in this manual, or warranty inquiries, please contact BLU Products customer support. You can typically find contact information (phone, email, or support portal) on the official BLU Products website.





