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How to unlock 3G USB modem E173U-1 with customized fireware from Metfone mobile company in Cambodia?

05 Aug 2012
Windows
Chrome 20
05 Aug 2012 | Windows | Chrome 20

I bought it from Metfone mobile company. I also have tried unlocking it many times. The best result is only unlocked temporarily. Do you know how to unlock permanently for free.