Download Android KitKat 4.4.2 stock firmware for Eken V90 tablet from here or here. Download previous firmware from here.
Firmware details
Archive: a33_8723-8703_v90_800x480_siv121d_siv121d_0402
Image: a33_8723-8703_v90_800x480_siv121d_siv121d_0402闪光ç¯.img
Archive size: 279 MB
Support: Allwinner A33
FW version: v2.0
Style: V90
Company: Allwinner
Pixels: 800 X 480
Build number: astar_y3-eng 4.4.2 KVT49L 20150402 test-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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