@ma7fouth Okay, let's see if I can help you:
If Wi-Fi still does not work in version 6.0RC2, I recommend that you post the model of your motherboard and the network card, stating the problem in this topic:
https://forum.recalbox.com/topic/16941/recalbox-6-0-rc2-is-released
Regarding the BIOS, it is prohibited on the site to request or broadcast any content that has copyright, therefore, you will have to obtain them on your own.
What I can help you on this subject is to direct you to this Wiki link:
https://github.com/recalbox/recalbox-os/wiki/Add-system-bios-(EN)
In it says where to put, which names and MD5 CRC are correct for each emulator.
NOTE: The system is case sensitive, so the names and extensions of the BIOS must be exactly the same as what is requested. An easy way to check if the BIOS is being recognized is through Recalbox Manager, but if you are without internet, this is not possible ...