Bios Mods -The Best BIOS Update and Modification Source

Updated BIOS via windows to A19.
Black screen, fan on full and unresponsive.
Tried creating boot pen drive.
Cannot produce .hdr and .rom files from Dell BIOS download,Win Flash Parameter error.

Using the Down key, ac power up routine does make pen drive light up but no screen response.
I gather it needs the BIOS files opened by a specialist.

Does anyone have a set of files to restore this BIOS via a pen drive?

Does anyone have any other advice?

Any help to restore my old trusted laptop would be very welcome.

Thanks

Ray