Hi KiddaC you are my saving man. I did as you wrote and my Dinobot U5mini came back to life. I have been in trouble by following your procedure because into Misc Pref I could not get any Mac address write option but as soon as I put usb stick with Mac.txt that option appeared again. After rebooting and entering Android I went to power option and selected start E2. The unit rebooted and after initian screen entered into OpenATV 6.2. I must thankyou so muchh. I went through many many forums to get support to my problem but only you could give me the proper suggestion. I will keep your procedure as a very very important matter and I think it could be very usefull for many Dinobot users.
Now I am tuning satellites channels and everything else. I could not succeed in getting working multichannel audio before the crash of the unit. I could not get working my Onkyo receiver with Dolby TrueHD or DTS MA HD signals. I will check it.
One more question. Now that the unit seems back to operate do you suggest to move to Android 8 that is still in beta version and seems to give the E2 trouble (the E2 boot option is no more available) considering that somebody says that by using Mac.txt that problem seems to be solved?
Thanks again for your kind support. I really appreciate your help