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Hi all,

Not sure if anyone has done this but I was curious if there was a way to enable the failsafe boot when you are booted into the main filesystem (root). I've seen the write-up on how to do it "physically", see here: forcing invocation of Mazda Connect failsafe mode. I figured this could be used as a nuclear option if you screw up your tweaks so badly that you can't figure out how to undo them. It really requires you to have the watchdog disabled which most of us have done already.

I was going to write a script for it but then I figured there might be a script on the CMU that already does it. After looking through the CMU files, I found a script called configure_flash.sh that is used for flashing the CMU from scratch. Buried in the script is a function called switch_ibc which is what I wanted. The function configures the boot-select block of the flash. Passing 1 sets normal boot (main filesystem) while 2 (or anything else) sets the block to boot from the failsafe. Booting into the failsafe will prompt for a USB containing an upgrade file, as shown in the write-up linked above. I modified the script to only set the failsafe boot. I have yet to test it (I kind of don't want to if I don't have to) but I am pretty confident that it will work. I am attaching the modified script and the original if anyone is interested.

EDIT: Doing a search AFTER I posted this (doh), I see there was a discussion about the script I used. They don't talk about it from the perspective of a nuclear option but the post contains a lot of great information about how the boot process works. Link here: http://mazda3revolution.com/forums/1394714-post2265.html
 

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Hi My name is Peter from hungary.
First of all sorry for my English, is not perfect.
I have bought a 2016 Cx-5 from Us market, and shipped to Europe.
I have red a lot of forums about firmware and update , and such a things, I wanted EU map for the car, after a lot of search on the net a found a guy from Ukraine, who did it for me. He sent me the EU sd card navi, and I had to send him the file , and he sent me back the pached file, so the navi is working great, all Europe map included.
So my question is that possible to update the CMU firmware as well?
Because I did not found I clear thread about it, someone said , just stay at the original religion otherwise you will brick your CMU.
I want to upgrade the firmware , because the Language options and the correct radio tune, I am not sure there is a Hungarian language in the EU firmware eighter.
If you can give me a right answer for me , I would be appreciate this
thx.
 
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