For the HP Compaq dc7900 (Ultra-Slim, Small Form Factor, or Convertible Minitower), the most reliable way to obtain the firmware is through the official HP FTP or support site.
dc7900 convertible minitower Bios - HP Support Community - 9560060 hp compaq dc7900 bios bin file link
Depending on your computer's current state, choose the appropriate flashing method: For the HP Compaq dc7900 (Ultra-Slim, Small Form
: Available as a direct download: Download sp54033.exe. Release Info sp54033.html. Original dc7900 USDT BIOS (sp73584) : Download sp73584.exe. How to Extract the .BIN File For the HP Compaq dc7900 (Ultra-Slim