I have 3 cm4s with 8GB emmc. I flashed the first one to raspbian just to try and it all works great. I have done the other 2 with dietpi and would like to reflash the first one to dietpi. I cannot get the emmc to mount or have rpiboot detect it. I have set the usb 2 port to node 1 (the node I want to reflash) and it is not detected. Does anyone know what the problem is here? This is on a Turing Pi V2 with the latest firmware.

I had some issues flashing with slot 1, so try a different slot.

Yes, Node 1 is problematic on some boards, so temporarily move the module to another node to flash it

I will do this. The strange thing is there was no problem flashing raspbian in the first place. I have actually ordered a i/o board so may do it that way.

Yes, flashing (but only this) in node 1 can sometimes work and sometimes not