Choosing Option 1 will not work if you are on GB now. Those are the Fastboot files for people that are on ICS and have problems, you can't just flash those onto any phone. I am not sure what you should do now, maybe use the 1.7 Utility for a stuck ICS and have the GB update on your SD card and install from there?
You "MIGHT" be able to use the 1.6 Utility and option 1 to restore back to .181, but I do not know that for sure so I would not try it until someone else chimes in. I don't want you to mess your phone up anymore, I would recommend reading a bit more before trying stuff like this.
I think your only option would be to use the 1.7 utility for fix a stuck ICS, that will trick your phone into thinking you are on the .181 boot.img and loader. From there you "MIGHT" be able to have the .181 update on your Ext-SD card and install it from there, or even if you have the ICS update .211 on your SD Card you "MIGHT" be able to load that one instead and be on stock ICS.
Again might wait for someone else to chime in on this one, and as always READ READ READ then PROCEED.