As Pi users, we know that our boards are driven by an ARM processor. We can find these processors in tons of devices such as routers, modems, cellphones etc. An ARM developer will use C language and will probably use it's own firmware and/or some free or proprietary RTOS or run install some Linux OS similar to what happen with the Raspberry PI.
It's also known that PI boards have it's own closed proprietary firmware and bootloader. My question would be, is it possible to flash that processor using JLINK or any other Cortex Programmer device, so we can use the hardware different as intended and if so, can I roll back to it's original Raspberry Pi firmware?