only two ideas:
1. something goes wrong with the flashing. i see aou have the images and don't need to download them. if you flash both images don't use the -R on the first! so that you don't reboot inbetween the flashing. use the -R only with the second. with that use it, and order might matter.
2. the eemc and firmware don't match or are corrupted(you said you did the update via flashing so this is possible). unfortunately for you that would mean to find an internet connection and download the two images and make sure you have two that match(and i think there are regional differences but don't know what they are. to be on the save side i'd use one for your region).
try to flsh them without rebooting inbetween and reboot via flasher after the second.

don't know only two ideas....