Download Android KitKat 4.4.2 stock firmware for D107 tablet

Download Android KitKat 4.4.2 stock firmware for D107 tablet from here or here. 

Firmware details
Archive: update_D107_loader2.25_ink_0329
Image: update.img
Platform: Rockchip RK3188
Archive size: 311 MB

Boot version: 2.25
Firmware version: 4.4.02
Build number: rk3188-eng 4.4.2 KOT49H eng.qiaohy.20160324.114239 test-keys
Model number: rk3188
SDK version: RK30_ANDROID$(PLATFORM_VERSION)-SDK-v1.00.00 \

Source