Help Installing Custom ROM on Note 3
 

I have an AT&T Note 3, N900A

Currently rom (Android 4.3)keeps giving me Unfortunately, direct pen input has stopped error. Even factory reset, error still exists

I want to install a newer rom, perhaps 4.4.4 or even android 5

i heard AT&T blocked boot logger? However also heard using Safestrap you can install it

Anyone got info or have done it in the past?

I would head over to the XDA forums.. its much better to ask the people there who are more experienced with the phone...