AT&T version of this thread: http://forum.xda-developers.com/showthread.php?p=47413669
Started with N900AUCUBMI9, rooted via RDLV (N900AUCUBMI9_OneClickBin)
accepted OTA update (i know) to N900AUCUBMJ5, lost root
Wanted root back, attempted RDLV again, got SECURE CHECK FAIL : cache, stuck in...