Question regarding ROOT and ROMs on old Galaxy Tab 3

Hello, I'm new here and I'll go straight to my issue. A couple of days ago, I was gifted an old used galaxy tab 3 (3G and Wifi, 7 inch, SM-T211). The thing is, I did a factory reset from the OS BEFORE noticing it was already rooted and should've done it from the TWRP. What's more, it strangely left lots of data after it (super su is still installed, it left photos and accounts remembered). So, question #1: Is it safe to do a factory reset now, even after I incorrectly did it from the os. (btw, check root says the root is still ok) Then, my other question is regarding the OS version. It currently has 4.1.2 Jelly Bean and while it tecnically supports 4.4.2 KitKat oficially, the official repository from Samsung doesn't have a version for my tab's region (T211ZSANB1, Hong Kong and China). Question #2: Is it safe to install a 4.4.2 oficial rom for a different region (i assume not due to the differents 3G frequencies used, but still wanted to ask). Finally, while I looked up and down in the forum and the only rom I've found for my specific device (a CM11 kitkat build) has a non functional camera. Question #3: does anyone know if there isany fully functional build on the site and, if the is not, is it safe carry both a stock and a cm rom and switching between them on a regular basis?

Thanks in advance to everyone

from xda-developers http://ift.tt/2aZFP2S
via IFTTT