Middle volume of a three-part RAR archive for model A226B firmware, binary revision U5, version A226BXXU5BVH2 on Android 12 (OS12). At 1.80 GB it carries a chunk of the package and requires part1 and part3 to decompress. The file name gives no detail on package format, so check after extraction whether it is a MediaTek scatter set or a regular update package. Matching the build's binary digit to the device is essential, as downgrading the bootloader revision is normally blocked.
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.