Forget about Bitmain helping you out with this - they won't. I've uploaded my S2 image file for you here:
https://www.dropbox.com/s/py9jus9mk3tk21e/bitmain.img.zip?dl=0
Use win32diskimager to format your SD card & burn the image.
Realize that doing this will still leave you open to the "stratum redirect attack" you have been experiencing, but it won't do you any harm to try. The image is the exact same one as I am currently using in my S2's - so it's clean & working 100%. I suggest you hound Bitmain constantly until they do as they promised & release an updated S2 image file with the latest cgminer in it that will fix the security issue.
Good luck