So I've been at this for a little bit now with no luck so far. I am attempting to dual boot Linux OS (thinking of a couple different versions), however I can't even get my SP4 to boot from multiple different USB devices. My flash drive gets registered by multiple PCs with no issues and I have my .ISO file on there. I did use Rufus to set up the flash drive to become bootable. I also disabled bitlocker and SecureBoot as I have read all different tips for how to do this. I set USB device as the primary device to boot form and my Surface still boots to Windows. I disabled Windows boot entirely and it still booted to Windows. I swipe left on USB device and it takes me right back to BIOS settings. I tried holding volume down and pressing power to boot directly to USB and I still boot directly to Windows 10. Running out of ideas. I've seen plenty have this same issue but have not seen a fix that works for me. Any help would be greatly appreciated.