When I tried to do a syscheck, it got stuck on the "Testing ios vulnerabilities" So this is the final result
sysCheck v1.6.2 by Erik Spyder
Region: NTSC-U
The system menu v481 is running under IOS58 (rev 6176)
Hollywood v0x21
Console ID: 135282993
Boot2 v4
Found 55 titles
Found 27 IOS on this...
On the series s/x you can use a external HD but any next gen games must be on your internal ssd, or you can buy a ssd expansion card, but pricey. Any xbone, 360, or og Xbox games can be played from external tho.