Flashing custom ROMs, stock firmware, or firmware updates can corrupt the NVRAM/NVDATA, causing IMEI to become 0049... or null.
Disconnect the device, pull the battery if removable, power it back on, and dial *#06# to verify the fix. Troubleshooting Common Errors "Failed to Open Serial Port"
58.77 MB (RAR password: Bader Tec)
Locate the original IMEI on the device sticker or battery compartment (dial to check current status). Write and Reboot:
One of the most significant new entries is the , released in August 2025. This tool is designed specifically for UniSoc (Spreadtrum) chipsets and supports a wide range of popular CPUs, including the SC7731E, SC9863A, and the newer Tiger series (T606, T612, T700, etc.). spreadtrum imei repair tool new
The virtual serial port created in Windows when the phone successfully enters Diag Mode.
Mobile technicians frequently encounter Spreadtrum (now rebranded as UNISOC) devices with corrupted network configurations. When an Android smartphone or tablet shows an "Invalid IMEI," "Null IMEI," or "Emergency Calls Only" error, the device cannot register on any cellular network. This issue typically happens after an improper stock ROM firmware flash, a failed root attempt, or a corrupted NVRAM/NVDATA partition block. Flashing custom ROMs, stock firmware, or firmware updates
For Spreadtrum (SPD/UNISOC) devices, several new and updated tools are available as of early 2026 for repairing "Invalid IMEI" or "No Service" issues. These tools are typically used for educational or legitimate repair purposes on brands like Infinix, Tecno, Itel, and Nokia Popular Spreadtrum IMEI Repair Tools WriteIMEI Tool (R1.6.4.1 or newer)
For more complex repairs or newer Unisoc chipsets, many technicians use professional boxes like UnlockTool Pandora Online ChimeraTool for better compatibility. Are you trying to restore an IMEI after a firmware update , or is the device currently stuck in a Troubleshooting Common Errors "Failed to Open Serial Port"
Run the tool . You’ll see a GUI with: