Working BIOS for the Dell OptiPlex 9020 All-In-One, with the board code IPPLP_AZ and PCB markings BTC 202B and E220370 included in the name. Delivered as a 9.97 MB RAR archive; extract it and confirm the dump size fits the SPI flash chips on your board before programming. E220370 is a UL file number printed on the PCB, not a model identifier. Read and keep a copy of the original flash first, since service tag and system data may need to be carried over to the written image.
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 →