Download Android 4.4 stock firmware for Onda V919 4G Air Core8 Tablet from here or from here. If you have another Onda tablet then search here your firmware.
Firmware details Firmware: V919 4G Air Core8_v1.0.0_v1
Model: Onda V919 4G Air Core8 Tablet
Archive size: 693 MB
Platform: Mediatek MT6752
Project: v801
Config_version: V1.1.2
Platform: Mediatek MT6752
Project: v801
Config_version: V1.1.2
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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