For educational purposes, here is the general workflow using a legitimate tool like the official SPD IMEI writer. Do not apply this with a patched version.
Prerequisites:
Steps:
A "patched" version of v41 has been modified by third-party developers to bypass original licensing checks. Common modifications include:
⚠️ Legal and Security Warning: Using patched tools violates Spreadtrum's software license agreement. Many "patched" versions circulating on forums contain malware, remote access trojans, or altered drivers that can infect repair PCs. Some countries impose heavy fines or imprisonment for IMEI tampering. spreadtrum imei tool v41 patched
Before any flashing, backup NVRAM via Miracle Box (licensed) or SP Flash Tool with region protection disabled.
On many Spreadtrum phones with Mediatek-like engineering menus, you can restore IMEI without any PC tool: For educational purposes, here is the general workflow
Corruption results in "IMEI null" or "Invalid IMEI" in settings, and "No service."
Tecno, Infinix, Itel provide ResearchDownload tool and ImeiWriter_Unisoc for registered repair centers. Steps: