The term could refer to a couple of different things depending on your specific goal:

In many jurisdictions, it is illegal to change or modify a device's IMEI number. This tool should only be used for repairing an invalid or "null" IMEI back to its original factory state as printed on the device's original packaging or label.

The latest version of the SC7715 IMEI tool comes with several improvements and bug fixes, including:

Changing or repairing an IMEI is intended only for restoring original device functionality. In many regions, changing an IMEI to a different one is illegal. Always use your device's original IMEI found on the sticker under the battery or the original packaging. Sc7715 Imei Tool Latest Version UPDATED - Google Docs Sc7715 Imei Tool Latest Version UPDATED - Google Drive. Google Docs How to use Spreadtrum WriteIMEI tool

Due to the age of the chipset, "latest version" tools are often repacked versions of older utilities. The primary software solution for this specific chipset is the or specialized ISP (In-System Programming) tools.