basta apenas criar uma conta no site creio que ja ficara disponivel para dowload e o procedimento que eles fala é esse
Install ROM:
FactoryDownload/UpgradeDownload/ResearchDownload
1 Unpack ROM and extract SP7731C_C20H_JHQ_LOGIC_64+4_160906_B1+5.pac
2 Run UpgradeDownload or FactoryDownload or ResearchDownload, connect your android device to the computer
3 Click on "Load packet" and add the .pac
4 Click on "Start"
5 During the flashing your mobile will restart automatically
6 Finish