maybe my English is so poor.sorry for that. The device (G510-0010)dual-sim it is different from Ascend G510(G510-0200) because the Ascend G510 is single-sim. If G510-0010 flash the rom which is made for he G510-0200 the net work doesnt work so the model is for G510-0010 If you want run the rom in your dual device you can flash the zip for that After you flash the zip(model-en) ,you can flash all the rom for G510-0020 the net work will be working!!!! but only the sim1 canbe used