My Mazda 6 firmware upgrade was messed up and could I take some advice from those who have been there. I missed the step of installing the Failsafe install and went straight to Reinstalling the package. The system reaches 2%, then repeat and does the same. I guess that's why they wanted fail safe in the first place - lol. Anyway, does anyone have any suggestions on how to get out of the mess I'm in? Getting me back to where I started is all I need. Thanks.

 

Sorry for your trouble, at this point you should try another smaller USB drive with the same version 70.00.100ADR and see if continues installation from that point on but first remove Room fuse or disconnect negative battery terminal for a few minutes.
If this method doesn't work the other option is programming SIP ROM with another failsafe firmware. For this you would need to remove the head unit and purchase a CH341A programmer and a 16 pin to 8 DIP test clip.
It's not entire your fault early fw versions were poorly written and failsafe wasn't safe at all. Good Luck.

 

You realize that this may disable his immobilizer right?