First RAR volume, 1.80 GB, of a dead boot scatter package built around firmware A125FXXS2CVK2, binary revision U2. The Android version is not given, so check the contents. Extract starting here with part2 present. Scatter firmware is written with MediaTek flashing software such as SP Flash Tool, often in BROM mode when the phone will not power up normally. Confirm the binary matches the device, since downgrading the bootloader revision is usually refused, and back up calibration partitions first.
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.