To get to a stock/undrooted 1.2, you will need to go back to 1.1/1.0.1 stock/unrooted, and then apply the 1.2 updated.
There are a couple of ways to get back to stock 1.1/1.0.1:
1 - if you haven't installed Clockwork Recovery to the internal memory, you should be able to do the 8x reset method; and then do a wipe afterwards.
2 - if you have installed clockwork recovery, use that to flash a stock 1.1 rom which will put you back to stock and uninstall CWR all at once.
3 - if you have an SD card, you can install CWR to that and use that to flash a stock 1.1 rom (instead of either 1 or 2 above).
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