Yoga 13 - BIOS update kills Intel RST

My Yoga 13 had the fan noise issue and I ran the recent fan embedded controller (EC) update to 66EC42WW from the Knowledgebase article. My BIOS is at 66CN52WW after the Jan 28 BIOS update (66cn52ww.exe). After the EC update and a cold boot I get the error message that Intel RST is no longer properly supported on my Yoga 13. Also, there is no longer a BIOS setting to enable/disable Intel RST.
I uninstalled and tried to reinstall Intel RST, but get an error message that the system does not support it. I suppose this is due to the BIOS setting missing. I then went to the Yoga 13 driver page to see if there were any newer/older BIOS files and the Jan 28 BIOS update is now TOTALLY gone.
So, a few questions:
1. Was there an issue with BIOS update 66CN52WW that forced the update to be pulled?
2. If so, what were the problems?
2. If the BIOS did have problems for those of us who applied the update, is there an older BIOS file we can reflash to restore Intel RST?
3. If we do reflash with an older BIOS what should we do about the fan update? Go back to the original or keep the new one?
Thanks for your input.

Thanks. As I mentioned in my post I have uninstalled RST, and the PC runs fine. In researching the effects/benefits of RST it seems it enables a faster restarting hibernate mode that uses less battery power than the normal Windows sleep. This may be important when traveling and away from an electrical outlet for a while.

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