First part of a two-volume RAR set holding an A125F scatter firmware package, binary U3, labelled for UnlockTool. The name states no exact build string or OS version, so inspect the scatter and image files once unpacked. Such packages are used to reflash a MediaTek device after a bootloop, failed update or service operation, with the scatter text guiding where each image goes. Extract from this volume with part 2 present, check the U3 revision against the handset and back up important partitions before writing.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @mrepairo. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →