Download latest Android KitKat 4.4.2 Stock Firmware for ZTE V5 Red Bull U9180 smartphone from here or here. Download another ZTE firmware from here.
Update file name: ZTE U9180 4.4.2 FW
Archive size: 397 MB
Model: signed_2759_u9180_44.zip
Model: signed_2759_u9180_44.zip
Platform: Qualcomm MSM8926
Build number: X9180-user 4.4.2 KVT49L eng.nubia.20140806.182713 release-keys
Build number: X9180-user 4.4.2 KVT49L eng.nubia.20140806.182713 release-keys
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.
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