My ematic egq367 is stuck in recovery mode.

My eMatic tablet,model no.EGQ 367 is stuck in recovery mode. Tried hard reset but still going into recovery. This tablet has a Rockchip RK3126 processor with 1024x 600 resolution screen, , has 16 GB storage and runs on Android 5.1 version. The people at eMatic are no help at all. They do not supply stock firmware but tried to sell me a new tab as a replacement. Not worth it.The SD card slot is not working. But I can SIDELOAD firmaware using ADB. Only thing is I do not have firmware. The one I downloaded from chinagadgets.com has signature problem. Any help is deeply appreciated.