Failed to process command CNXN error 0x120000

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http://forum.xda-developers.com – So I'm at my wit's end. Phone is on android 2.3.6, build 4.5.141 The problem: When I restart the phone into fastboot it will give me the error "Failed to process command CNXN error (0x120000)" over and over until I pull the battery. How I got here: So far I've tried two 'one click' root tools (bad idea). Upon realizing these didn't work I started doing step by step tutorials. What I've tried: Resetting to factory, loading a full sbf (2.3.6 and 2.3.4.. the latter gave a "Failed to boot 1" error until I reloaded the 2.3.6 one). End goal: Getting CM9 on my phone as per th (HowTos)