if you are using E680i (A6P) and dont want to flash to ABP, then you can try my c5_a4 multi language GUI. It includes portuguese accented characters keyboard + portuguese GUI. No need to install seperate keyboard for portuguese, my multi latin based keyboard has all portuguese accented characters including "ç".
Go to my home page
http://vllp.sourceforge.net to download 2 files:
1. ThreeSearch_C5_A4_multi_language_gui_1.0.zip
2. ThreeSearch_portugues_lang_pack_1.0.zip
No need to flash your phone, just copy it using telnet (your firmware is still C5A6):
cp c5a4_cg35_multigui_1.0.nkc /dev/tffsa
Note: you need to install language pack before install multi language GUI.
Difficult to detect and very subtle,
the mind seizes whatever it wants;
so let a wise man guard his mind,
for a guarded mind brings happiness.