Here you can download last WWE /english version of firmware:
For users who wants to change their language to English:
Exe file must be extracted with following batch file(p835abisplit3.exe M10_ALL_V6.15.0_Modem_V4.7.8_Ship_WWE_app_IDN00_V5 .1.8.exe)
Than put *.abi file to your Storage card and put phone in boot mode.Rom will
be upfraded to English version.