[Q] Problems topic

I have combed through the threads and read til' my eyes are sore and I can't find what I'm doing wrong. I have downloaded several of these ROMs for the TAB 12.2, I'm rooted with twrp and flashify and all that. I can't get any but one, CM12, to flash successfully. Omni was slosest but the rest simply won't boot or they freeze at startup. Please tell me what I'm doing wrong. Is it a kernel issue? Because I can't find any kernels that work with the ROMs.

bux