As I had a kindle touch working, I used mfgtool on it in order to boot in diagnostics mode so I could check and compare with the bricked one I already had.
The thing is that the working one no longer works, and seems to be bricked also.
The steps I follow were:
-Start the kindle in recovery mode
-load diagnostics with Mfg tool
-from diagnostics menu start fastboot mode
-check the kindle with yifan lu fastboot only with reading commands. No flashing at all. only "fastbool getvar <varname>" and "fastboot check <partition>"
at this point the kindle didn't reboot in normal mode, so I started it up in recovery mode again and with the mfgtool started the kindle with the "kindle main" profile option.
and that's all, never came back to life again,
Is it possible that I could brick a working kindle touch only with the mfgtool program? 'cos it's the only program that has written into the device.