Disclaimer: Modifying your IMEI is legal only if you are restoring your device's original IMEI (printed on the back of the phone or box). Cloning or changing IMEI to bypass tracking is a federal crime in most countries. This guide is for repair purposes only.
Prerequisites:
Before using the repair code, understand why the IMEI disappears:
Most users search for an engineering code that works like *#*#3646633#*#* (MediaTek). SPD does NOT have a universal IMEI repair code that works via the dialer alone. Any claim that typing *#*#36466#*#* or *#*#83781#*#* will directly write an IMEI is false. Those codes may open engineering mode, but writing requires a secure partition write blocked by Android 7+.
However, older SPD devices (Android 4.4–6.0) had limited access. Let's explore real codes.
There is no magic single-line code to repair IMEI on SPD Android smartphones. The codes listed (*#*#83781#*#*, *#*#3646633#*#*) only open engineering menus for testing — not writing.
For a successful repair:
If you are not a technician, the safest path is to visit an authorized service center. Attempting IMEI repair without proper tools and knowledge often results in a hard-bricked phone (no power, no charging, no detection).
This guide was last updated for SPD/Unisoc chipsets (SC7731, SC9832, SC9863, T606, T610, T616, T618, etc.). Always verify your exact model before proceeding.
Disclaimer: This guide is for educational purposes only. Changing an IMEI number is illegal in many jurisdictions and can result in network blocking or legal penalties. It is intended for technicians repairing devices to restore the original IMEI lost due to software corruption.
Here is a technical guide regarding IMEI repair on devices running on Spreadtrum (SPD) chipsets.
| Error | Cause | Fix |
| :--- | :--- | :--- |
| Write IMEI Failed: Enable DRAM Failed | BROM not entered correctly | Reinstall SPD drivers, use short test point |
| S_BROM_CMD_STARTCMD_FAIL | Preloader mismatch | Use correct PAC file or Miracle Box autodetect |
| IMEI remains null after reboot | NVRAM lock (SPD NvLock) | Must flash a patched NVRAM from a working phone |
| AT command not found | Root access incomplete or wrong device path | Install busybox, try /dev/smd0 or /dev/ttyUSB0 |
Unlike other chipsets where you need a PC tool (like SN Writer or Maui META), most SPD devices have a hidden engineering menu accessible via a dialer code.
The most famous and frequently cited SPD Android IMEI repair code is:
Before diving into codes, understand the root cause:
If you want, I can produce a step-by-step, model-specific walkthrough (include device model and whether you have NVRAM/PAC backups).
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You're looking for a report on SPD Android IMEI repair codes. Here's some information:
What is SPD Android IMEI Repair Code?
SPD (Spreadtrum) Android IMEI repair code is a unique code used to repair or change the IMEI (International Mobile Equipment Identity) number of an Android device powered by a Spreadtrum chipset. The IMEI number is a 15-digit serial number assigned to a mobile device, and it's used to identify a device on a cellular network.
Why is IMEI Repair Code needed?
The IMEI repair code is needed in situations where the IMEI number of an Android device is damaged, corrupted, or changed accidentally, causing issues with:
How to obtain SPD Android IMEI Repair Code?
To obtain the SPD Android IMEI repair code, you'll typically need to:
SPD Android IMEI Repair Code Format
The SPD Android IMEI repair code is usually a 8-digit code, which is entered into the device using a specific tool or software.
Some popular tools for SPD Android IMEI Repair
Some popular tools for repairing SPD Android IMEI include:
Caution
It's essential to note that improper use of IMEI repair codes or tools can cause permanent damage to your device. Additionally, changing or repairing an IMEI number may void your device's warranty. Therefore, it's recommended to exercise caution and only attempt to repair or change the IMEI number if you're experienced and familiar with the process.
For Android devices using Spreadtrum (SPD) or UNISOC chipsets, the IMEI repair process usually involves entering a specific secret code to access Engineer Mode or using a PC-based tool. 1. SPD Engineering Mode Codes
You can often access hidden menus to check or modify hardware settings by dialing these codes in the phone's dialer: Primary Engineering Mode Code: *#*#83781#*#* Alternative SPD Codes: *#*#111222#*#* *#*#46349#*#* (Common for some SPD-based Samsung clones)
*#*#3646633#*#* (Commonly for MTK, but sometimes used on SPD/clone devices) 2. General IMEI Repair Methods spd android imei repair code
If codes do not work or the device is "Invalid IMEI," specialized software is typically required.
Repairing or changing an IMEI is often necessary if the number becomes "Invalid" or "00000000" due to software corruption, firmware flashing, or a factory reset. For Spreadtrum (SPD) / Unisoc Android devices, this can be done via secret dialer codes or specialized PC tools. ⚠️ Important Legal Note
Changing an IMEI is illegal in many countries, though it is used for legitimate "repair" (restoring the original number) in others. Only proceed to restore your device's original IMEI found on its box or under the battery. Method 1: Secret Dialer Codes (No PC)
Some SPD-based Android devices allow access to "Engineer Mode" or an "IMEI Write" menu directly from the dialer. Try entering these codes: *#*#83781#*#* (Most common for SPD/Unisoc) *#*#3646633#*#* *#06# (Use this first to check your current IMEI status) Steps in Engineer Mode: Navigate to the Telephony or Connectivity tab. Look for IMEI Information or Radio Information. Select the SIM slot (Phone 1 or Phone 2).
Enter the command: EGMR=1,7,"YOUR_15_DIGIT_IMEI" (Note the space after AT+).
Tap Send AT Command. You should see a "Command Sent" message. Restart your phone. Method 2: SPD WriteIMEI Tool (Recommended)
If dialer codes don't work, you must use the official Spreadtrum utility on a PC. Requirements: SPD USB Drivers: Installed on your Windows PC. WriteIMEI Tool: (e.g., version R21.0.0001 or newer). USB Cable: A high-quality data cable. Steps: Open WriteIMEI.exe on your computer.
Select Port: In the tool, click on Mode Select and choose Normal Mode (or Calibration Mode depending on your device state).
Enter IMEI: Type your original 15-digit IMEI numbers into the "IMEI1" and "IMEI2" fields.
Connect Device: Power off your phone. Hold the Volume Down (or Volume Up) button and connect it to the PC. Start Writing: Click the Write or Start button in the tool.
Verify: Once the progress bar turns green and says PASS, disconnect and reboot your phone. Troubleshooting Common Issues
Invalid IMEI / No Signal: If the repair "succeeds" but you still have no signal, try a factory reset from settings.
Drivers Not Found: Ensure you use the TFT Driver Installer or official SPD drivers if your PC does not recognize the phone in "Spreadtrum COM Port" mode.
Root Method: For advanced users, apps like IMEI Changer can work if your device is rooted and has the Xposed Framework installed.
The air in the cramped workshop smelled of solder and old lithium batteries. On the workbench sat a sleek but silent Infinix phone, its screen flashing a dreaded message: Invalid IMEI. For its owner, it was just a paperweight. For Leo, the local tech wizard, it was a puzzle.
Leo knew that Spreadtrum (SPD) chipsets could be finicky. He reached for his reliable Toolkit, knowing the first step wasn't a physical tool, but a digital one. He tried the "old school" approach first, tapping a series of symbols into the dialer. Disclaimer: Modifying your IMEI is legal only if
"If you're lucky," Leo muttered, "*#*#46347#*#* will open the door".
The screen flickered. A hidden menu—the Engineer Mode—revealed itself. This was the "code" many sought, a back door into the phone’s most sensitive hardware settings. However, the software was stubborn. The "Invalid" status remained, likely caused by a corrupted partition during a previous update.
Leo shifted to his PC. He launched the SPD Write IMEI Tool, a specialized program designed for UniSoc/SPD devices.
"Okay, let's do this the official way," he said, following a precise sequence:
Preparation: He sourced the original 15-digit IMEI from the sticker behind the battery.
Connection: He powered off the device and held the Volume Down button while plugging it into the USB port to force it into Diag Mode.
Writing: On the tool, he selected 'Normal Mode,' entered the digits, and hit Write. The status bar on his monitor crawled forward. PASS.
Leo rebooted the phone and typed the universal command: *#06#. The numbers popped up instantly. The signal bars jumped to life, and the workshop was suddenly filled with the chime of incoming messages. The repair was complete.
For Spreadtrum (SPD) or UNISOC Android devices, "IMEI repair" typically refers to restoring an Invalid, Null, or 0000 IMEI that occurred due to software corruption, such as a failed firmware flash. Common Engineering Mode Codes
Many SPD-based phones allow access to hidden repair menus via dialer codes. Note: These codes vary by manufacturer and specific chipset. *#*#83781#*#* – Common for SPD/UNISOC engineering mode.
*#*#3646633#*#* – Standard engineering mode for many Chinese chipsets.
*#*#46349#*#* – Specifically used for some SPD "S3" series devices. *#06# – Use this to verify your current IMEI status. Legitimate Restoration Tools
If dialer codes do not work, official or professional after-sales tools are used to write the original IMEI (found on the device box or under the battery) back to the NVRAM.
SPD Write IMEI Tool: A widely used utility for writing original IMEI numbers to Spreadtrum devices via a PC connection.
Aftersales Tool v7 (CarlCare): Often used for Infinix, Tecno, and Itel devices to fix "Invalid IMEI" issues.
UpgradeDownload / FactoryDownload: Standard SPD flashing tools that sometimes include NVRAM management options. Crucial Legal and Technical Warnings There is no magic single-line code to repair