here's a guide to fix that active cmdline overflow, you messed up one of your partitions and your phone wont work until you fix that issue, you need to follow that guide to the letter, do not skip any parts, read it all first and understand it, if you get any of the commands wrong you could end up with a complete brick so copy and paste them.

http://forum.xda-developers.com/show....php?t=2739126