I have the firmware. However, I don't know whther it will wirk on ur gs1. I bought gs1 from Korea. I'll find the link for u. Just wait....
Sent from my YP-GS1 using xda premium
Motorola Motoroi(Korean version of milestone XT720 ) XT720
Motorola MotoQRTY(Korean version of Milestone ) XT854
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HTC Desire HD A9191
LG Optimus LTE2(Korean version of Spectrum2) F160K