[Q] Android 4.1.2 received - killed Tethering. How do I go back?

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http://forum.xda-developers.com – Hi All, My wife and I have a stock SIM-free 9020a's which were updated OTA to 4.1.2 this week. Today I've come to tether my Android tablet to it and though it connects there is no data throughput. Same on my wife's. Both worked fine last weekend. I have read that this is an issue seen by many and is a topic on the Google Help forum. Until this is fixed by Google, how do I go back to 4.1.1 please? Thanks! (HowTos)