Here is another question that very remotely might be related to firmware or may be is a non-issue.
I will be very specific. Mining on f2pool, I noticed that my old S2' s GHS is closer to what shows up on workers page of account.
But for C1 (runs on 225MHz), the miner shows 900+ GH/S(5s) and f2pool shows less say 689 (20 min avg). It goes little up and down but stays way less than the one on miner. I watched on miner consistently and that number stays close to 900 on miner. This is a one time test and I didnot repeat and could be just a temp weird situation but did get my curiosity.

Anyone can please explain this or has anyone else noticed this ever.
Am afraid to upgrade S2 firmware to new version with cgminer 4.6  for that reason bcz C1 has 4.6 (latest firmware).