hello there,
It seems that the fault is deeper than originally thought (which is rather normal for iPads, they are difficult devices to repair, especially in untrained hands). Remove the home button (disconnect it) and try to start the tablet again. The recovery mode clearly indicates that at least one of the devices on the motherboard has no contact or shorts its circuits to ground. The motherboard needs to be removed and inspected for all circumstances. However, the repair should not be expensive and rather short. Due to the broken Home button, you will probably lose Touch.ID functionality.