Boot verification certify - LG G2 D800

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http://forum.xda-developers.com – I have the AT&T variant (D800), and got a popup that a software update from AT&T was available, so I tried to install it. The phone was rooted, and I think I had the stock recovery. I tried to flash CWM using ROM Manager from the Play Store, but everytime I tried to boot into recovery I got the "Error: boot certification error" on the LG logo screen. So I tried to get the software update, which turned the phone off. It didn't boot up for like half an hour, so I tried to turn it on. I got the "Boot certification error," and then the phone went to the black screen. (HowTos)