i have/had this same initial issue. i followed the above steps. found that my user folder did not have the prg.flg file. so i created a text file, then renamed it prg.flg (made sure the file extension changed) then insert that into the user folder on my head unit. this is also a z140bh. now my unit will boot, gives me the navigation message, you hit ok. it takes forever to select past that. then the screen just goes blank. if i hit home it will bring the main menu up but i cant select anything. if i hit mode it will bring up the radio side and i can select an input and the radio works, but is