It worked.. :/
Two things i did. and it start flashing... do not know which one effectuate it.
1. Removed External SDcard.
2. Fastboot flash in CWM, to start phone in CWM. Here i wiped data/factory reset, wiped cache partiton, wiped dalvik cache. (I guess this thing provoke the flashing).
Started phone in flashmode, and flashed with stock ftf. Happy
as it did not stop the operation this time .. :P