Recovery Corrupt ?

Hi, i have firm 51.1.1.0 with root and busybox installed, and i'm trying to downgrade to version 51.1.0.2 but in the step 7 on the guide from AFTVNews

7. Run the command: chmod 777 /cache/recovery (HERE SAYS ME No such file or directory ! Already i'm follow whit the 2 commands to create the directory)

mkdir /cache/recovery ( HERE SAYS ME THE FILE ALREADY EXIST !! )

I Try to continue with the guide obviating the error but that not works...

I'm trying to make a factory reset whit te combinations of keys Alt + Print Screen + i and when the recovery screen appears the home button don't show me the options...

What is wrong here? Is a semi brick or what?

Thanks !!