Originally Posted by crackface
Any idea what could have been going on?
I'm not sure. It sounds like it couldn't mount sd card maybe?
Often when getting an update or using odin to go back to stock, a factory reset will fix bugs that may cause, especially stuck on the bootup screen. So it boots ok now?
Your problems before may have been with TWRP, but I don't know for sure. I know 188.8.131.52 version was having problems with the t-mobile phone.