Can I expect to be able to downgrade my tablet's T-Mobile firmware to the earliest available release and later restore it to the latest T-Mobile version w/o:

1) tripping KNOX (currently 0x0)?
2) losing ability to receive/install future OTA updates?
3) losing data?

Device is at latest version from T-Mobile and never rooted and rooting not sought. Have done this w a prior Tab w/o incident.