Part 1 of a two-volume RAR set containing scatter firmware for model A326U, MediaTek MT6853 chipset, Android based. Beyond model and platform the name carries no version or binary level, so open the scatter and image files to identify the build. Such packages are used to recover a bricked or bootlooping unit by rewriting all partitions through SP Flash Tool or similar. Extract from this volume with part 2 present, check bootloader compatibility and back up NVRAM to protect IMEI and calibration data.
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.