Download latest firmware update for Onda V819 4G LTE Tablet from here or from here. You can download previous stock firmware from here.
Firmware: V819_4G-S8+16GB-V1.0.6-20140924
Model: Onda V819 4G LTE Tablet
Image file size: 442 MB
Platform: Intel Z3735E
Onda V819 4G LTE Tablet Specs
Model: ONDA V819 4G LTE Quad Core Tablet PC
CPU: Intel Z3735E, Quad Core, 1.8GHz
GPU: Intel HD Graphics
Operation System: Android 4.4
RAM: 1GB (DDR 3)
ROM(Memory): 16GB Nand Flash
Shell Material: Plastic
Screen: Size: 8.0 Inch
Type: Capacitive Screen, IPS
Display: LCD
Resolution: 1280 x 800px
Visible Angle: 178°
Extend Card: Support TF card up to 32GB extended
Camera: Dual camera, front is 2.0 megapixels, back is 5.0 megapixels
CPU: Intel Z3735E, Quad Core, 1.8GHz
GPU: Intel HD Graphics
Operation System: Android 4.4
RAM: 1GB (DDR 3)
ROM(Memory): 16GB Nand Flash
Shell Material: Plastic
Screen: Size: 8.0 Inch
Type: Capacitive Screen, IPS
Display: LCD
Resolution: 1280 x 800px
Visible Angle: 178°
Extend Card: Support TF card up to 32GB extended
Camera: Dual camera, front is 2.0 megapixels, back is 5.0 megapixels