Sorry don't speak Spanish. I can some words with context, but that's about it.
I forgot to mention earlier, but the factory reset is in the screen with the yellow triangle and the green android. Access it by holding Vol+ while powering on. Press Vol+ and Vol- at the same time to access the menu. Here's a little help for sbf flash and linux.
I use debian sid, which ubuntu is based on, and I've never had to do anything special for the phone to be recognized. Actually, I didn't have to do anything. There are rules for udev to give user level access to adb, but I don't use them. Superuser only. I don't want my cat stepping on the keyboard and accidently doing an "adb shell rm /what/ever" command. She's done worse......
While I haven't tried this, you could use an ubuntu live cd with the sbf_flash and the Bravo sbf on the root directory of a usb thumbdrive, sdcard, ect.. and open a terminal window and go to the directory with the files (cd /path/to/files) and run the commands "su" then "./sbf_flash ./p4_kobe_umts_kobe_user_3.4.2-125_KOB_FFW-4_product-keys-ATT-US_ATT-signed.sbf" , both without the quotations, and that should flash the Bravo in 3 minutes or so. I don't recommend renaming the sbf file for possible bad signature and overall safety.
After that, you may have to factory reset if it doesn't boot up right away. I've read about people flashing the sbf up to 3 times to get it to boot. I had to flash twice in a row, both with factory resets, to get it to boot after the Defy kernel accident.
It's really hard to hardbrick these phones because of our LOCKED bootloader, but easy to softbrick if flashing roms out of step.
Also, and REALLY important, leave your phone on a wall plug or car charger for a few hours before doing this. Flashing the sbf drains power, and its possible that you WILL hardbrick your phone if the power goes out.
I'm not positive, but you may be able to right click and use open terminal here inside the folder with the files. Haven't use Ubuntu since 9.04.
To make Linux help & copy/paste easier