Ok, I fixed it, follow my instructions as they goes. You have to flash the .img kernel that CM10.2.zip comes from.
For flashing it, go as follows...
First try to install the following drivers, with Flashtool. The executable is in C:\\Flashtool\drivers
Run as adminsitrator and follow screen instructions, allow any driver install.
When it's ready, try to plug in the phone in fastboot mode (turn off, hold power and vol up and release power button, led has to turn blue/violet/pink, whatever, a color like that)
Flashtool will recognize the phone as the log says, if its not try to install drivers mannually.
If it's recognized then click the black lightning button and select fast boot mode.
At the right side click "Select kernel to flash" and browse the kernel that comes in the .zip. (in the file you've downloaded you have to extract a boot.ini because is the main kernel to make the ROM work, so you have to put somewhere else, I prefer desktop)
When selected, log writes all the procedure until it show an "OKAY[time]" message.
Finally click "Reboot device into system" in the center side and wait until boots.
It should be working now, I spent a lot of hours investigating, but finally I fixed, hope it works for you too!
If there's an error or some question, feel free to post.