re: Issues with S2 firmware, have you considered running Kano's firmware ? I've been running it since shortly after taking delivery and haven't had any issues with my S2's.
What are the problems you are seeing with your S2 ?
Besides the inherent vulnerability that hasn't been fixed? Well my S2s get the same or LOWER hashrates on Nicehash and Westhash. That's a problem for me personally. I'd love to see an S2 firmware load from Bitmain that includes a recent version of cgminer. But bitmain seems intent on merely pushing new hardware out the door. And I'd actually consider buying their new hardware IF they actually supported the products they'd already sold.
Kano's firmware might be excellent but the thing is as customers we shouldn't have to run someone else's firmware to have a secure, up to date version of the S2 firmware. That's like expecting everyone who buys an iPhone to root it and load Android so they can have an up to date OS on their phone.
So Bitmain - please consider honoring your support commitment and release a new version of the S2 firmware before you continue to flood us all with SPAM to buy your latest hardware.