[Q] S3 stuck at bootloop, no recovery...help

my samsung galaxy s3 wont boot up

i am only able to access download mode. No recovery mode.
tried flashing with odin. sometimes stuck at NAND WRITE START.
sometimes FAIL

i'm able to go to download mode where i can see my product name. so possibly i'm not facing problem with emmc fail or sds.


please suggest possible solution.