Unable to rename Sony SRS-X7

[FBornemann]

I have a X88, a ZR7 and a X7. For the X88 and ZR7 the renaming work fine under System in Settings in the Music Center App. But the X7 does not have the menu System in Settings. 

Any suggestion on how to get there?

kind Regards

Flemming

[FBornemann]

Picture from the guidePicture from my X7