mobile

I up rom to chinese B011 KitKat 4.4.2 / EMUI3.0 (7d-501u), music is fine. I can download music. but recently I can't download music anymore.... it says 'Network busy... please try again later'. I have already clean cache.... root.... delete host.... uninstall updates... delete odex.... but it still same.... what can I do to get back to download music?