  We reexamine generation of the primordial magnetic fields, at temperature
$T>80$TeV, by applying a consistent kinetic theory framework which is suitably
modified to take the quantum anomaly into account. The modified kinetic
equation can reproduce the known quantum field theoretic results upto the
leading orders. We show that our results qualitatively matches with the earlier
results obtained using heuristic arguments. The modified kinetic theory can
give the instabilities responsible for generation of the magnetic field due to
chiral imbalance in two distinct regimes: a) when the collisions play a
dominant role and b) when the primordial plasma can be regarded as
collisionless. We argue that the instability developing in the collisional
regime can dominate over the instability in the collisionless regime.
