[Q] imei-"null/null"

i dropped my galaxy note in water............after that my mobile wasn't able to start so i opened and unlocked the complete hardware and allowed it to dry......then i kept it in rice bag for 24 hours...............
now everything works absolutely fine except the sim slot..........*#06# shows imei-"null/null"
baseband version is unknown
moreover i am not able to flash any rom via odin.........even if i put on download mode and leave for hours , nothing happens.

guys can u suggest me what to do?????????