Stock BIOS versions (3944, 4034, 4627, 4817, 5101, 5530, 5713, 5838) each contained minor bug fixes and, critically, updated security measures to block softmods and hardmods. The number 4627 comes from the kernel version.
If you are building a brand-new Xbox hard drive mod today: xbox 4627 bios
The author and this platform are not responsible for any damage or bricking of your Xbox 4627 during the BIOS modding process. You mod at your own risk. Stock BIOS versions (3944, 4034, 4627, 4817, 5101,
You can check your BIOS/Kernel version by going to the screen in the original Xbox Dashboard. The version number will appear at the end of the scrolling text, usually preceded by a "K:1.00." You mod at your own risk
The 4627 BIOS shipped exclusively on motherboards (v1.2, v1.3, v1.4) that contain a notoriously leaky (often a gold or black cylinder near the IDE bus).
If you are a purist restoring a "revision 1.4" Xbox and you want to run a setup or a custom dashboard (UnleashX, XBMC-Emustation) without extra hardware, TSOP flashing a 4627 console is the cleanest method.