You can’t download this ROM manually yet. If you want to upgrade, you first have to firmware flash to CXQ_V3A_INEW_V07, after that, you can do the OTA upgrade to V09. Note that you can’t do this trick from V08 (yet).
Archive name: CXQ_V3A_INEW_V09
Archive file size: 460 MB
Platform: Mediatek MT6592
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.