I had cognition 4 but wanted to try serendipity 7. When I used CWM to install the zip it said installed but nothing happened. So I hit reboot phone but it kept looping on att screen. Now I cannot get back into recovery mode by holding both volume buttons. My phone constantly loops the att screen. The white att screen pops up, stays for three seconds, the screen gets slightly brighter, then the top half of the screen disappears, then it loops again. Did I brick it?