Instead, search for the official Unisoc (Spreadtrum) Upgrade Tool or ResearchDownload along with the specific SC7715 modem database (BPLGU) for your exact build number.
Click Write and wait for the "Pass" or "Green" message.
: Specifically targets SPD SC7715 and similar chipsets for repairing invalid or lost IMEI numbers. Multi-Address Support
Enter the original IMEI number (found on the phone's sticker or box) into the input fields.
and ensuring the correct COM port is selected in the tool's interface. Antivirus Interference