Firmware and Hardwer details

[mencwelp]

Hello
As we all know H8 wasn't the best purchase no more support  .
And we cannot count that Himedia or Futeko release any firmware in nearest future.
Taking that into consideration I like to try to upgrade my H8 with some existing RK368 images using RockChip_FactoryTool or RK_Android_Tool or RockChip_Batch_Tool.
So can you tell me please which USB port is OTG  and hot to run H8 in such mode?
doI need special cable or USB just A to A ?
Hot te boot into recovery?
I don't mind if I will brick that box it is useless anyway without DRM support as it's in Android 6.0+ and all patches that are needed for RK! and are not available in stock firmware.

PS
I have already bought other box based on Analogic, twice cheaper and with perfect community support !