IMEI repair on MT6771-based devices is straightforward using MediaTek’s official tools, provided you have the original IMEI numbers and proper drivers. Always prioritize backing up the NVRAM and protect partitions before any flashing. When done correctly, network functionality can be fully restored.
For device-specific instructions (e.g., Ulefone Armor 7, Blackview BV9800), always consult XDA Developers or the manufacturer’s service manual.
This content is for educational and lawful repair purposes only. The author assumes no responsibility for misuse.
MediaTek MT6771 (Helio P60) Go to product viewer dialog for this item.
is a widely used processor in mid-range smartphones. During custom ROM flashing, formatting, or updating, users frequently experience a corrupted NVRAM (Non-Volatile Random-Access Memory). This corruption causes the device to lose its International Mobile Equipment Identity (IMEI) or display it as "Unknown" or "Null," effectively cutting off all cellular services.
Repairing the IMEI on an MT6771 processor requires specific tools and matching database files from your device's stock firmware.
⚠️ Legal Disclaimer: Changing a device's IMEI to match another device is illegal in many jurisdictions. The instructions below are strictly for restoring the device's original IMEI, typically located on the physical sticker under the battery or on the original box. 🛠️ Required Software & Files
To repair the IMEI on an MT6771 device, you generally need the following desktop utilities:
Maui Meta or ModemMeta Tool: The official, standard utility used to write physical data directly to MediaTek modems.
MediaTek (MTK) VCOM Drivers: Critical drivers required for your Windows PC to properly communicate with the phone while it is powered off.
Stock Firmware (ROM): Specifically, you need the firmware corresponding to your exact phone model to extract the necessary database files (MD1_DB and AP_DB).
SN Writer Tool: An alternative official MediaTek program used frequently for writing barcodes and IMEIs.
Chimera Tool or UMT Pro: Paid, specialized technician software that simplifies this process into 1-click solutions if free tools fail. 🔑 The Core Concept: Database Files
Unlike older MediaTek chips where you could execute simple AT commands in Engineer Mode, newer chips like the MT6771 require specific modem database files to communicate with the hardware security layers. You must extract these files from your phone's stock ROM:
BPLGUInfoCustomAppSrcP... (MD1_DB): This contains the modem parameters.
APDB... (AP_DB): This contains the application processor parameters.
Without pointing your repair software to these exact files, the software will fail to establish a successful handshake with the MT6771 chip. 📝 Common Step-by-Step Restoration Methods Method 1: Using Maui Meta (ModemMeta)
This is the most reliable, free, and standard pathway used by technicians.
Install Drivers: Install the MTK USB VCOM drivers on your computer.
Load the Software: Open Maui Meta and set the connection type to USB.
Connect the Device: Power off your phone completely. Click "Connect" on Maui Meta and plug the phone into the PC. Do not hold any buttons unless prompted.
Enter Meta Mode: The phone will turn on to a stationary logo screen (Meta Mode).
Load Database Files: Once connected, the program will ask for the MD1_DB file. Navigate to your extracted stock firmware folder and upload it. Mt6771 Imei Repair
Write the IMEI: Open the "IMEI Download" option from the tool's drop-down menu, type in your original 15-digit IMEI (leaving out the 15th digit on some tools as it calculates automatically), and click "Write." Method 2: Fixing Baseband First
In severe corruption cases on the MT6771, both the IMEI and the Baseband version will read "Unknown". You cannot write an IMEI if the Baseband is Unknown.
To fix this, you must first flash the secro.img or perform a complete firmware write using the SP Flash Tool.
Once the Baseband version returns to a valid string of characters, you can proceed with the Maui Meta or SN Writer method to fill in the missing IMEI.
🎯 Key Takeaway: Always back up your NVRAM partition via custom recovery or SP Flash Tool before making any firmware modifications on an MT6771 device to avoid this issue entirely.
To help me tailor instructions specifically to your device, could you let me know: The exact model of your MT6771 phone?
Is your device currently showing a valid baseband version, or is that unknown too?
Do you have the original box or sticker with the factory IMEI numbers? Ulefone Armor 6 lost IMEI and baseband - Hovatek
How to Repair IMEI on MT6771 (Helio P60) Devices If you’ve recently flashed a custom ROM or performed a factory reset on your MT6771 (Helio P60) powered device—like the Realme 3, Nokia 5.1 Plus, or various Ulefone and Blackview models—you might have encountered the dreaded "Invalid IMEI" or "Null IMEI" error. This often leads to a "No Service" status, making your phone unable to make calls or use mobile data.
Restoring your device's original IMEI is a common maintenance task, but it must be done carefully using the right tools for the MediaTek (MTK) chipset. ⚠️ Important Disclaimer
Legal Warning: It is illegal in many countries to change or clone an IMEI number. This guide is strictly for restoring your device's original IMEI (found on the box or under the battery) to fix software-related issues.
Risk: Proceed at your own risk. Incorrect flashing can lead to permanent bricking. Preparation: What You’ll Need Before starting, ensure you have the following:
Drivers: Install the latest MTK USB VCOM Drivers on your PC so your computer can communicate with the phone in "Meta Mode" or "Preloader Mode".
Original IMEI: Locate your 15-digit IMEI number from the original box or the sticker behind the battery. Battery: Ensure your phone is charged to at least 50%. Method 1: Using Professional Tools (Recommended)
For the MT6771 chipset, specialized service tools are often the most reliable because they handle the security layers of newer Android versions. Using ChimeraTool Launch ChimeraTool on your PC. Power off your device.
Connect it to the PC while holding Volume Up + Volume Down to enter boot mode. Once detected, go to the Repair tab and select Repair IMEI. Enter your original IMEI and click Start Procedure. Using Infinity CM2 MTK Open the CM2MTK module. Select the MT6771 CPU/Platform in the settings. Navigate to the Security tab.
Enter the first 14 digits of your IMEI (the tool usually calculates the 15th digit automatically).
Click Write Security, then connect your powered-off phone to the USB cable. Method 2: The "No-PC" Engineering Mode (Free)
This method works on some older firmware versions or devices where the CDS Information menu is still accessible.
How to use Infinity CM2 MTK to write IMEI to Mediatek devices
Repairing the IMEI on a device with the MediaTek MT6771 (Helio P60)
chipset typically involves restoring the device's original identity after a software failure, such as a "Null IMEI" or "Invalid IMEI" error. ⚠️ Critical Legal & Safety Warning IMEI repair on MT6771-based devices is straightforward using
In many countries, changing an IMEI to anything other than the original factory-assigned number is
These methods should only be used by authorized technicians to restore a device's IMEI (found on the box or SIM tray).
Incorrect procedures can permanently "brick" the device or cause total loss of cellular connectivity. Preparation Checklist Backup Data:
Always backup your personal files, as some methods require a factory reset. Install the latest MediaTek VCOM USB drivers
on your PC to ensure the computer can communicate with the phone in "BROM" or "META" mode. Ensure the device has at least 30%–50% battery to prevent it from turning off during the process. Hardware ID:
Locate your original IMEI number on the device's original box, SIM tray, or under the battery. Method 1: Using ModemMeta Tool (Recommended for MT6771)
ModemMeta (formerly MauiMeta) is an official-style tool for MTK devices that operates in "META Mode". Launch Tool: Open ModemMeta and click "Connect." Enter META Mode:
Power off the device. Connect it to the PC while holding a volume button (usually Volume Down or both) until the tool detects it in META mode. Load Database: Select the (Application Processor Database) and (Modem Database) files specific to your device's firmware.
Go to the "IMEI Download" tab, enter your original IMEI(s), and click "Write to Target."
Once the tool confirms success, disconnect and restart the phone.
Method 2: Using Professional Service Tools (Technician Level)
Professional tools often provide a "One-Click" solution for MT6771 devices by exploiting the Bootloader (BROM mode).
How to fix an invalid IMEI issue on your smartphone - Airtel 15 Mar 2024 —
Repairing IMEI on an MT6771 device is a precise job. For most users, Maui META Tool remains the gold standard. However, due to MediaTek’s increasing security (SLA/DAA on newer P60 variants), you may need to first bypass authentication using MTK Bypass Utility.
If you are not a technician, consider using professional dongles (e.g., Chimera, Easy JTAG, Octoplus) which automate the process safely.
Need help identifying your exact MT6771 variant? Check the kernel version in Settings > About Phone.
MT6771 IMEI Repair: A Complete Technical Guide The MT6771 chipset, popularly known as the MediaTek Helio P60/P70, powers a vast range of mid-range smartphones from manufacturers like Oppo, Vivo, Realme, and Xiaomi. While these devices are robust, software glitches, improper rooting, or corrupted NVRAM partitions can lead to an "Invalid IMEI" or "IMEI 0" error. This results in the device being unable to register on a cellular network.
This guide explores the technical foundations of MT6771 IMEI repair, the tools required, and the safety precautions you must take before beginning.
Disclaimer: IMEI repair should only be performed to restore the original IMEI number of a device. Changing an IMEI to a different one is illegal in many jurisdictions. Always ensure you are compliant with local laws.
To repair the IMEI on an MT6771 device, you generally need:
Repairing the IMEI on devices powered by the MediaTek MT6771 (Helio P60) chipset is a common technical task for those dealing with "Invalid IMEI" or "Null IMEI" errors, often caused by improper software updates or flashing. 🛠️ Common Tools for MT6771 IMEI Repair
MT6771 devices utilize a specific architecture that requires specialized service tools to communicate with the device's NVRAM (where IMEI data is stored). Popular options include: Maui META Tool: The official MediaTek This content is for educational and lawful repair
service tool used to interact with the device in "Meta Mode". Pandora Box /
: Highly reliable professional hardware boxes for flashing and repairing MTK security data.
UnlockTool / Hydra Tool: Modern software-based solutions that support "Brom Mode" for one-click repairs. 📝 Basic Repair Workflow
While every tool differs, the general process for an MT6771 device follows these steps:
Preparation: Install the latest MediaTek VCOM drivers and ensure the device is powered off.
Enable Meta/Brom Mode: Connect the device to your PC while holding the Volume Down or both Volume buttons to trigger the correct diagnostic mode.
Load Database Files: Some tools require the specific MDDB (Modem Database) file for the MT6771 to correctly identify the hardware addresses.
Enter Original IMEI: Input the original IMEI numbers (usually found on the device box or under the battery) into the tool's interface.
Write and Reboot: Execute the "Write" command and restart the phone. You can verify the fix by dialing *#06# on the dial pad. ⚠️ Critical Note on Legality
Repairing a "corrupt" or "null" IMEI to restore the original manufacturer's ID is a standard technical repair. However, changing or masking an IMEI to bypass blacklists or local regulations is illegal in many jurisdictions. Always ensure you are restoring the original IMEI belonging to that specific hardware.
Do you need a step-by-step guide for a specific tool like Maui META or UnlockTool?
How to fix an invalid IMEI issue on your smartphone - Airtel
If you want, I can:
The MT6771 chipset, also known as the MediaTek Helio P60 , often requires IMEI restoration if the identification data becomes "null" or "invalid" due to software flashing or corrupted NVRAM. Legal & Safety Warning
IMEI repair is strictly for restoring the device's original ID.
Changing an IMEI to a different number is illegal in many jurisdictions. Always use the original IMEI found on the device’s back panel or original packaging. Common Repair Methods
Technicians typically use specific software tools to communicate with the MT6771's modem in
⚠️ Important Legal Warning: In many countries, changing or tampering with an IMEI number is illegal. It is often associated with fraudulent activities, such as unblocking stolen phones. The information below is provided strictly for educational purposes and for legitimate repair technicians fixing devices where the IMEI was corrupted due to software errors (e.g., a bad flash). Do not use this information to clone IMEIs or bypass blacklists.
The MT6771 chipset (commonly found in devices like the Oppo F11, Vivo Z1 Pro, and various clone devices) requires a specific method for baseband repair. Unlike older MediaTek chips (like MT6580 or MT6735), the MT6771 often uses a modem database (BPLGU) approach.
This is the free method, suitable for generic tablets or "clone" devices using the MT6771 platform.
The MediaTek MT6771 (also known as the Helio P60) is a popular 12nm chipset found in many mid-range Android devices (e.g., Ulefone, Blackview, Oukitel, Doogee, and some Xiaomi or Realme models). IMEI (International Mobile Equipment Identity) numbers are unique identifiers for mobile devices. Corruption or loss of IMEI can occur after firmware flashing, rooting, or software glitches, resulting in “Invalid IMEI,” null IMEI, or no network service.
This guide explains the causes, prerequisites, and general methods to repair IMEI on MT6771 devices.
