Few things to try:
Update RSD Lite to 5.6 here
, it's the one I always use on my MS2
Make sure you are using the Brazilian Retail 2.3.6 SBF from here
( direct link
), download it again just to be sure
Extract it using 7-zip
(or WinRAR or anything else, although I think 7-zip is more reliable... personal opinion)
Just turn the phone on the "Bootloader" screen (the black screen with some white text on it) nad flash the SBF again using RSDLite.
you are still stuck on the red M logo, where it is throwing some "sonic waves" around (bootanimation screen), and RSD Lite is telling you to "Please manually power up this phone." even after many minutes, you need to turn off your phone (remove the battery) and turn it on again but this time holding the X button, you should see the "exclamation mark" screen (if not, try again) in which you can press @ (multiple times if needed) until you get to a "Android system recovery" screen, now using the volume down key go to "wipe data/factory reset", confirm using the power button, after a while it finishes and then "reboot system now"
After this, wait until you get to "Bem-vindo(a) ao MOTOBLUR" white screen and you're good to go!
Let us know how it goes!