BIOS archive for the Acer A515-51G on Compal board LA-E892P revision 1A, and the name also lists C5V01 LA-E891P. It is 4.87 MB in RAR format. The LS token likely refers to a daughterboard but is not certain. The two LA numbers belong to the same Compal C5V01 platform family. Open the archive to see which image fits your board before writing it to the SPI flash with a programmer. Check the PCB number and revision, and keep a backup of the original chip.
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 @biosarchive. 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 →