An archive of repair files for Huawei hardware. Shared as “FRP HUAWEI MRD-L21 ALL SECURITY WITH TEST POINT_by_GeekLock.rar” — a .rar file, 473 KB.
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.
7-ZipWinRARThe Unarchiver (macOS)