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@matthewf01 : Depends on your FW 74.
- Downgrade process is like the upgrade process.
- A downgrade requires the firmware files for the desired firmware you want to downgrade to. There is no option you can tick like "downgrade to version before" in the MZD.
- Via MZD update/downgrade process you can only downgrade from lower versions than 74.00.310 to any lower version - as far as 59.00.502. (e.g. from 74.00.200 or 74.00.230 you can still downgrade to e.g. 70.00.367 or 70.00.100).
- If you have an installed 74.00.310 or higher, you can only downgrade via MZD to 74.00.310. Lower versions of firmware at the usb stick are not shown/can not be selected. So 74.00.310 is the new 59.00.502 - at that it`s the same. (e.g. from 70.00.311 you only can downgrade to 74.00.310 - even if the firles of 70.00.100 are also at the usb stick).
- If you have 74.00.310 or higher installed, you can only downgrade to a lower version as 74.00.310 using the method described in the thread called "Black Screen MZD" (via SPI NOR chip flashing). (example: 74.00.311 then can be downgraded to 70.00.100)