Thanks Meter 1
Join Date: May 2010
Location: Oklahoma City, OK
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I rooted and flashed the Synergy Rom on my GSIII, as well as my fiancee's and my brothers. My phone was the only one to display this custom lock icon (randomly). I'm pretty sure it had something to do with flashing the cwm touch, then the cwm6. To fix it, I read users gained success just by wiping cache and dalvik, but it didn't work. So I tried flashing the stock recovery instead (hearing it's a recovery issue that 'throws' some sort of flag). It didn't fix the issue. I even ODIN'd back to stock, and it still didn't fix the issue. Everything I tried didn't work.
However, after I went ahead and re-rooted using the root66 method, then installing cwm touch, and then booting into recovery, wiping system, data, cache, dalvik, performing a factor data reset, and then installing the Synergy rom (I used 1.6), (ASSUMING I was just going to have to deal with the custom lock icon forever).... it somehow magically fixed itself.
Hope that helps. Ever since then, it's worked just fine, no custom lock icon. Since then, I've booted into cwm touch, wipe cache/dalvik, and have even updated to the newest Synergy (1.7), and it's remained just fine.
Hope this helps.