SP Flash Tool v5.1516 is a Windows-based software application designed to read and write raw data directly to the flash memory (eMMC or NAND) of MediaTek-powered devices. It communicates with the device via USB while the device is in a special pre-boot state known as "Download Mode" (or "META Mode"), typically accessed by pressing specific volume keys when connecting.
On Android 5.1 and 6.0 devices, v5.1516 can overwrite the persist or nvdata partition to bypass Google account verification after a factory reset. sp flash tool v5.1516
It may work in Windows 10 compatibility mode, but not officially supported. SP Flash Tool v5
Because v5.1516 was released circa 2015, its "sweet spot" for compatibility lies with the following MediaTek chipsets. It is widely considered the most reliable tool for: Because v5
Note: While it may support newer chips like the Helio P10 (MT6755), official support and stability for 64-bit architecture improved significantly in later versions (v5.1728 and above).