OK, I was at cognition 2.1.1 and wanted to go to 2.1.2 but in my wisdom decided to apply a backup first. I went into ROM mananger and picked a original backup I took. It bombed on the data partition while apply and rebooted. Now I get a ton of errors once it boots up and can do virtually nothing because the errors pop up one after another with no stop. So I decided to redo with Odin. It will NOT go into download mode. I have tried about 50 times. I am pushing the up and down buttons and holding the power in at the same time. When it goes black the second time I let off the power. It just goes dark. PLEASE HELP!!!!