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
HTC Desire A8181
HTC Desire HD A9191
LG Optimus LTE2 (LG-F160K)
LG G3 D855 (Singapore)