It seems due to bootloader upgrade to bootloader 2, when it comes to flashing U1 to U or U to U1 there is a problem with booting devices. 2DUD5 and 2DUC8 means you are on bootloader 2. So when you were on Bootloader 1 after that whatever you flashed U or U1 that was bootloader version 2, your device got locked to that. It seems you flashed U1 ROM with Bootloader 2. You will have to be on U1 until a solution is found.I have a T-mobile N986U , I was flash to unlocked(U1) for UI3 beta and keep OTA update, now when I use Odin to flash back to T-mobile (U) it success and reboot automatic but it reboot 2 to 3 time then my phone boot to recovery mode but only had 3 option reboot, factory reset and recovery log. Phone work when I flash back U1 without data lost.
N986U1UES2DUC8 > Good
N986U1UES2DUD5 > Good
N986USQU2DUC8 > Can't boot
Anyone can help how to flash back to t-mobile with e-sim support?
Others feel free to correct me or update my info.