Thank you all.
I finally ignored the "explained like you're 5" tutorial because in that guide the phone is upgraded to 2030 baseband before installing CWM. That make sense because the goal of that guide is to upgrade to ICS/JB. Not my case.
So, following your advices i tooked another route. First, to root the phone i've followed the PaulOBrien thread:
That part worked perfectly.
The CWM was harder because having 109808 baseband i needed a old CWM.
I followed the "Help! I'm new and I cand do..." thread (http://www.modaco.co...-and-i-cant-do/), starting at step 3.
The problem was that the link for Easy CWM Recovery Installer from step 3a is broken. 20 pages later in that same thread there is a working link (http://www.putlocker...C58272EBA80A95F). I flashed recovery with that file and that installed CWM 22.214.171.124. From that i could install gbxtreme. Nice rom, kyan31, thanks!
Thank you all for your help.
Having 109808 baseband and hynix memory i'm not sure what is the latest safe CWM for me. The other CWM theads i founded were about CWM 6 or 5. This one CWM 126.96.36.199 worked well.
Maybe the first post of "Help! I'm new and cant do" thread could be updated with a working link or a md5sum of the img file to check other links..
Regards and thank you.