How can I update Samsung Galaxy SII SHW-250K from ICS (4.0.4) to jelly bean? I tried using samsung kies but it shows that "SHW-250K does not support initialising".


You can simply flash win Odin GT-I9100 firmware. Firmwares you can get from sammobile

Odin you can get from http://web.djodjo.org/?a=download:android:tools:win:bootloadertools

get Odin307

You can also check this tutorial for flashing with Odin.

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