BIOS and EC firmware for the Dell Latitude E6420, project PAL50 on Compal board LA-6591P, with reference designators U52 and U53 indicating which chips each file belongs to. LA-6591P is a Compal design built for Dell. Locate U52 and U53 on the board, read and save their current contents, then program each with its own image using an SPI programmer. Confirm the board number on the PCB and that each image size equals the capacity of the chip it is going into.
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.
All sources (7)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @biosarchive | 8 Dec 2021 | Open file on RM Schematics |
| @BiosSchematicWorld | 9 Dec 2021 | Open file on RM Schematics |
| @BiosSchematicWorld | 13 Feb 2022 | Open file on RM Schematics |
| @pepeelectronica | 24 Apr 2022 | Open file on RM Schematics |
| @schematiclaptopramkushwaha | 13 Jul 2025 | Open file on RM Schematics |
| @schematics_bios | 25 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 1 Aug 2026 | Open file on RM Schematics |
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 →