Default [Q] lg optimus g e970 stuck on download mode

i was trying to make a downgrade to ston on my lg optimus g e970 and i format the internal storage then i wipe the cache and the dalvik, at the end i reboot the phone by mistake without flashing a rom, i got stuck on a black screen after showing the lg logo. i enter to download mode to use lgnpst to se if i could flash a .bin file of the stuck jelly bean. it give me and error at 85% that says " fail to write partition system, 604160 th sector."
i tried to enter to recovery to se if i can do something else , and none of the combination with the botton works , it just go back to download mode everytime i turn on the phone. this is driving me crazy, i hope somebody help me with this plz
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