[Q] [HELP] I337 can't turn on download or recovery mode topic

Hi, i purchase this phone, and when i try to put him on recovery mode (i wanted to checked the version of recovery )... And for my surprise, i couldn't get enter... In the screen appear a message "Custom" with a padlock, after 10 seconds, the phone restars alone... il try to check the download mode, and the same... The "custom" message with the padlock... i hope you can help me, its the stock room, its rooted (i didn't root , came rooted from factory)... il try this metod http://forum.xda-developers.com/show....php?t=2296014 but don't work...
Sorry, i used the google translate, i can read english, but can't write very well hehe... Thanks