How to force the DFU mode
I can put my phone in the DFU mode, however once I attach it to the power supply (and therefore disconnect from iTunes) it brings itself back into the normal boot. I would like to probe the logic board with the multimeter in the DFU mode, but I find it difficult. Is there a way to keep the phone in the DFU mode? One option that came up to my mind would be to keep it connected to iTunes while probing. Or am I doing something wrong altogether and the phone should stay in the DFU mode?
Is this a good question?