Download latest stock firmware for Onda V975s Core4 Tablet from here or from here. You can download previous version from here. You can download another Onda firmware from here.
Firmware:V975s Core4_v3.4.0_v7
Image file name: V975s Core4_v3.4.0_v7.img
Model: Onda V975s Core4 Tablet
Image file size: 484 MB
Platform: Allwinner A33
FW version: V3.4.0_V7 / A33_U9781L1_4.4.2_20141117
Pixels: 1024 x 768
Style: V975s CORE4
Build number: astar_inet-eng 4.4.2 KVT49L 20140823 test-keys
ConversionConversion EmoticonEmoticon