Q: What is the difference between an IMEI number and a serial number? A: An IMEI number is a unique 15-digit serial number assigned to each mobile device, while a serial number is a unique identifier assigned to a device by its manufacturer.
If the IMEI shows as "Null" or "Invalid" due to corruption, and the software tool fails, you may need to rewrite the modem partition.
Download and install the correct on your Windows PC. Launch the WriteIMEI application as an administrator. Click on Mode Select and switch the setting to Normal Mode .
D. QCN/QPST-style (Qualcomm analog; mentioned for multi-chip shops)
+-----------------------------------------------------------------------------+ | SPD IMEI RECOVERY METHODS | +-----------------------------------------------------------------------------+ | +----------------------+----------------------+ | | [ Method 1: Dialer Codes ] [ Method 2: PC Tools ] | | *#*#83781#*#* or *#*#3646633#*#* SPD IMEI Tool / NCK Box | | Accesses Internal Engineering Mode Requires USB Debugging & Drivers | | Direct On-Device Repair Deep System Firmware Repair SPD IMEI Tool (Spreadtrum WriteIMEI) spd android imei repair code
The official firmware flashing utilities provided by Unisoc/Spreadtrum can rewrite core system partitions.
However, always remember your legal and ethical duties. These methods are for restoring your phone's only. Misusing them can have serious legal consequences.
If your device is experiencing network issues, you can use the dialer code to check your network configuration status. Open your phone's default . Type *#*#83781#*#* .
These codes are entered directly into the phone's dialer. Note that their effectiveness depends on the specific device model and firmware. Standard SPD Android Code *#*#46347#*#* Alternate SPD Code *#*#83781#*#* Secondary SPD Code *#*#889988#*#* Engineering Mode (General) *#*#3646633#*#* (often works for both MTK and some SPD clones) Repair Methods 1. Engineering Mode (No PC) Q: What is the difference between an IMEI
Install the Spreadtrum USB drivers on your PC. Download the WriteIMEI tool. Run WriteIMEI: Launch the SPD_WriteIMEI.exe application.
Go to the Connectivity tab and select CDS Information > Radio Information .
Found on your phone’s box or back sticker. PC/Laptop: Windows OS. SPD USB Drivers: Installed.
| Method | Tool Name | Main Features | Interface | Key Requirement | | :--- | :--- | :--- | :--- | :--- | | | WriteIMEI Tool R3.0.0001 | Writes IMEI, repairs Bluetooth/Wi-Fi, user-friendly | Simple Windows UI | SPD USB drivers; Diag USB mode | | PC Software | Miracle Thunder Tool | Flashing, unlocking, FRP removal | Professional Android service utility | Chipset-level compatibility | | PC Software | NCK Box / Dongle Modules | Firmware flashing, unlocking, IMEI repair | Dongle-based professional tool | Dongle hardware connection | | PC Software | CM2SPD Tool | NVRAM backup/restore, IMEI repair | Professional module interface | Requires Infinity Box or loader | | PC Software | TFM Tool Pro | SIM unlock, FRP reset, security write | Professional modem tool | BootRom mode support | | On-Device | Engineer Mode ( # #83781# # ) | Basic parameter editing via dialer code | Phone's engineering menu (if available) | Device-specific code support | Download and install the correct on your Windows PC
Since most modern Android versions block IMEI editing via simple dial codes for security, specialized software tools are usually required. These tools often require booting the device into .
If simple software flashing does not restore the network parameters, the device likely has a physical hardware failure. The PMIC (Power Management IC) or the RF (Radio Frequency) transceiver chip may have degraded, meaning no software code or computer program will ever restore cellular function until the motherboard is repaired. Conclusion
Note: Put a single space between AT and + if the system returns an error message (e.g., AT +EGMR ). Step 5: Save and Reboot
On some older or specifically configured SPD Android devices, you may be able to enter a secret menu to write the IMEI directly without a computer. Open the Phone Dialer app. Type one of the following codes: *#*#3646633#*#* (General Spreadtrum engineering mode) *#*#83781#*#* Go to > CDS Information > Radio Information . If available, look for Phone 1 or Phone 2 .