Rockchip Tablet RK3126 prepare idb fail when flashing firmware

[bobbycharlton]

I have a cheap rockchip tablet, a Proscan PLT9999G that has android 6.0 on it. One day, it started bootlooping, and I couldn't find the firmware for this tablet. I tried firmwares for the rockchip Rk3126 cpu, however either I have a white screen error, or the accelerometer just doesent work. Also, these are all android 5.1 fw's (the ones I tried). When short-circuiting the chip to go in maskrom mode like I usually did, now it shows prepare IDB fail on the pc. I have tried multiple tools, like rkbatchtool or rkandroidtool, same result, even when erasing flash or trying to flash bootloader. When booting from an SD card with a fw, it starts flashing, and then it fails and shows RKNandcache missing. The tablet has an esc, reset and power button, no physical volume buttons. So, I need help for 2 things.

1: Is there a firmware for this specific model of tablet? (Android 6.0 preferably)

2: How do I fix that IDB fail error?

Thanks everyone for your help!