I do not know how to change region and language code. Brazillian is supported, ask on that website how to set correctly.
WARNING - This will erase everything on tablet.
-Using a Computer-
Insert SD, miniSD, or MicroSD Card into a card reader
Format card to Fat32
Go to ->
HcH'z TechKnow [www.HcH.net.tc] - Login
Download Uberoid from link
Unzip file
run changer.bat
type 15 in Changer
press enter
yes to copy to SD card
type drive letter for sd card
press enter
When copy finishes, Safely remove sdcard
-On Tablet-
Insert SD card into tablet
Plug tablet in
Turn on
Wait for "Please remove SD" to show up
remove SD card, wait for Uberoid to load
Enjoy.