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Will there be a SonicOS 7 release be available for the TZ400?
Unfortunately, no. SonicOS 7 is only for the Gen 7 hardware like TZ 570 and 670 and SonicOSX 7.0 is for virtual firewalls like NSv 870 etc.
TZ 400 is a Gen 6 hardware and will have a 6.x firmware available.
I doubt if there will be a SonicOS 7 firmware release for the Gen 6 products like TZ 400, etc,., This is because, there is architectural change on the Gen 7 product. So, the firmware's supporting Gen 7 products need to be special than SonicOS 6.0 release.
Hope this helps.
Technical Support Advisor - Premier Services