simple upgrade from 2.3.4/2.3.6 to 4.0.4

pls kindly help me with info on how to upgrade tecno android 2.3.5 to 4.0.1 or above
 
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hai I'm from Indonesia
I had samsung gt-s6102....i already upgrade my samsung to ginger ice jelly in the next forum but still can install blackberry messenger , please help me what should i do ?
 
Possible firmware sch-i405 ZKW ARABIC

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or firmware sch-i405 ZKW en

Thankful for your cooperation
 
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i have a gionee Gn 105 its android 2.3.4 dual sim but when teid to upgrade it tells me certificate verification failed. what should i do?
 
Friends
I Want Upgrade Android version 2.3.6 to Latest (4.2) in my GT-S6802.... Plz guide me....