I'm having trouble removing a bios password from my latitude d631. I tried removing the battery for a few hours, and dozens of default master passwords. Nothing's worked and this is alot of trouble just to enable usb booting.

Try to update the bios. that should delete everything in the bios. just go to dell.com and look for the updated bios and update it.

There are a few options, if there is no small battery on the motherboard you can either replace the eprom chip or do a paperclip trick. on ebay there are password removal sellers for around $20
sometimes they can help , but it sounds like its locked in you eprom the paperclip trick involves removing the motherboard and powering on the laptop while jumping the pins on the eprom chip with a paperclip.

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771