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Can you check that M4s propeller isn't pressed down on the motor causing a friction?

If you now have a bus blaster you need to specify openocd to use that interface.

Can you try connecting to the bootloader and report the result.

When you have a JTAG programmer and are doing development I think that is the best option, but since you only need the Crazyradio to flash it with the bootloader it is a great option for those that don't have a JTAG.

This sounds like a tricky problem and since the bootloader fails to connect it makes it even trickier. My first thought was a corrupt firmware but since it worked before that is uniquely and I would have expected the bootloader to still work. Any sign of damage to any component? Is the behavior any ...

If you flash it with a JTAG you need to flash it with CLOAD=0. When doing this it will erase the bootloader but you can put it back later if you want.

Then we are a bit closer to finding the problem. Something is broken between the resistor with the green circle and the transistor leg, blue circle. First can you measure the resistance of the small resistor with the green circle? It should read close to 100 ohm. Then try to inspect the trace going ...

The resistor is a standard 0603 50V 1% resistor.

You need to define the right programmer interface to OpenOCD. Since you seem to have a JLINK try this:

Yes it is possible but it will require studying the nRF chip a bit and some coding. The radio chip can switch frequency in 140us so you can have them on different frequencies as well and not just different addresses.