@BRDX Your question is already explained in the comments above, any other answer would be what has already been said: It is not the Recalbox that requires the BIOS, it is the emulators.
It is not recommended at this time to use the web interface to check the BIOS, since version 7.0 there is an internal BIOS check, accessible through the Emulationstation Main Menu, the developers are working to improve the web interface.
RecalBox should be renaming the files on its own
It would take a lot of development work, and this would require an unnecessary effort from the system, is much more consistent for users to have common sense and rename files correctly. I repeat: the BIOS is required by the emulators, in the name, extension, and MD5 that the emulators require, because the emulators simulate the consoles, and the consoles are produced with their native BIOS, in the predefined name, extension and MD5, so , there is not much that can be done.
It is inconsistent for the small team of Recalbox developers to spend their time and effort on a feature that does not improve system performance, and requires the user only once to add the correct BIOS, in the correct name, extension and MD5.
Something like that has already been proposed by another user, and the conclusion is the same:
https://forum.recalbox.com/topic/23200/bios-avec-bon-md5-mais-avec-nom-différent
