Can I ask for one point of clarification; after following the SPI NOR method to install the 70.00.100 EU failsafe, and setting the FF on 00 values, when the CMU is back in the car and the forced update begins what is the expectation?Just as info: With an installed 74.00.310 NA you can not downgrade anymore (before including 74.00.230 NA this was possible for me). At the update/downgrade process it does not show lower versions anymore. But via the SPI NOR method described here, lower versions can be installed again. I tried it myself. I had 74.00.310 NA installed. Then I flashed the SPI NOR to failsafe 70.00.100 EU (file see post #88), changed the FF to 00, so that a forced update process began. At the usb stick were the two 70.00.100 EU firmware files, which were installed successfully. Now I have 70.00.100 EU again and can upgrade/downgrade like I want. Afterwards you can also install the firmware of other regions like NA or ADR.
Tip/hint: No files of lower firmware versions should be at the stick. Otherwise it tries to install them, which was not successful in my 1st try.
Thanks again to raoulh and Vien Tinh!
Hi dxdiag, pls keep me posted if you able to downgrade via SPI NOR chip method. TIAHello everyone. I upgraded my Mazda 3 to 74.00.311 and I want to downgrade to 70 or 59. Is the rewrite SPI NOR chip the only solution or does the serial connection give me root access to downgrade it? Thank you for your help.
Indeed!Of course... have you read the instructions/this thread? If not, please do so.
Edit: That you ask such a question, might mean that you better should not try this solution.