No boot logo, no download mode screen
i have a galaxy mega I9205 LTE, three weeks ago i have flashed the original 4.4 KK update from samfirmware, and from that moment i have no more boot logo (the one with the "Galaxy mega" words), and download mode screen. I have done a full wipe (clean cache, wipe data, and kalvin wipe) from CMW and original recovery, tried with CM11 rom, and other 4.4 roms (can't downgrade to 4.2.2
), nothing, my boot logo don't come out.
I think the fault is the bootloader, but i don't know if it can be restore or something like that.
How can i fix the problem?