Newer Models are CLASS 3 UEFI This means no LEGACY, NO CSM, 64 bit OS, WIN10 only Request Denied Forever. The machine thats not TOO old that will do what you want is INSPIRON 3847 Tower.   I suggest you find one on ebay. [URL]   [URL] Nvidia’s optional GeForce Experience software is also dropping 32-bit operating system support. Past Pascal all ATI, NVIDIA, INTEL, etc is WIN10 only 64 BIT only, NO MBR, No Legacy, No MSDOS, NO INT13, NO DOS VESA VIDEO BIOS,  No NTVDM 32 bit software support.  Even Linux is now 64 bit only. Last machines that allowed older OS were uefi class  2.3.1  win8 machines from 2012. By 2015 WIN10 1507 came out. Brian Richardson of Intel talked about the "last mile" barriers to removing legacy BIOS support from systems. By 2020, they will be supporting no less than UEFI Class 3, which means only UEFI support and no more legacy BIOS or CSM compatibility support mode. The last step in this conspiracy is to force Secure BOOT ON always and windows home users MUST Create Microsoft Account Giving up all privacy without compensation or permission. This also means any older software and hardware like video cards will not work or run in a class 3 win11 machine. [URL]   [IMAGE]  
I own an Inspiron 3880 desktop, but it only officially supports Windows 10. I hate Windows 10, and I would do anything to get Windows 8.1, or even Windows 7 on it.  As long as its not Windows 10, I'd be happy with it. -ELP
How can I install Windows 8.1/7 on Inspiron 3880?