mobile

Hi guys, as topic says i cant boot after flashing firmware with odin. everything installs perfectly in odin it says pass! ad below in details it says success1/fail0. But when odin reboots system its stuck at booting recovery.... And never go further into system. I have downloaded 5.0 from sammobile and http://www.galaxys5update.com/galaxy-s5-stock-firmware/ but samething. I flashed it 2 times, 1 time from each source. Also after flashing i cannot enter into recovery. So i flashed the good old kitkat for now... can anyone explain why i cant boot after flashing rom with odin, does it has something to do with bootloaer. also i did not update through software update thingy/kies caue it says you cant downgrade but i see many article in internet also on xda that you can with odin. whats the truth.