Ok, just to confirm that it works.
My tab was on 4.4.2 out of the box. I install CM11 directly without reading a little (my mistake), and I discover brightness dimmer issue... I play with Lux to try to find a solution during a week but no success...
So, the solution is to revert back to 4.2.2 stock (or to a rom based on 4.2.2 stock) to install the correct bootloader and then restore your 4.4.2 Nandroid backup.
Here the steps:
-Nandroid backup of your tab
-Titanium backup (in case of, double protection)
-Copy the zip into the internal memory of the tab
-Reboot in recovery mode
-Do a factory reset (wipe system, cache, data (except data/media))
-Flash the zip
-Wipe dalvik/cache (not mandatory but...)
-Reboot into recovery mode FROM recovery (do not reboot system at this point)
-Restore your Nandroid backup