Long story short, I used Odin 3.09 and installed VRUEMK2 via these instructions: theandroidsoul.com/unbrick-restore-verizon-galaxy-s4-sch-i545. Now my phone keeps getting "Unfortunately, System UI has stopped". It says this over and over again. I tried putting back ME7 but it fails in Odin.
Can anyone help? Is there a way to fix the System UI error on MK2? Or how can I go back to ME7? I can't use the phone because that message keeps popping up.