Is the zip file for v1.5 in the OP a 'universal' file in the sense that this can be flashed over both a US and WW version of PRIME!, or which one is it for? The current text in the OP doesn't offer up any other clues for me .
Never mind, I just tried flashing it over v1.4 WW anyway to see what would happen, it seems to be working so far. Worst case scenario: it stops working and I just end up reflashing v1.4 via nvflash.
[EDIT]: Tablet encryption actually seems to be working now, it didn't before . Now encrypting...