MP 1,1-5,1 MacPro5,1: What you have to do to upgrade to Mojave (10.13/10.14 BootROM upgrades instructions thread)

[Dayo]

@tsialex ... Do you think reversing an MP41 > MP51 crossflash (MP51.0089.B00) is viable as it seems the Nektas tool has an option for this?

Really want to play with a standard MP41. One that has never been crossflashed would have been brilliant but wondering whether reverting is an option since every example on the planet appears to have been crossflashed.

 

[tsialex]

@tsialex ... Do you think reversing an MP41 > MP51 crossflash (MP51.0089.B00) is viable as it seems the Nektas tool has an option for this?

Really want to play with a standard MP41. One that has never been crossflashed would have been brilliant but wondering whether reverting is an option since every example on the planet appears to have been crossflashed.

For sure not with the Netka's forum tool, back then when it worked, it worked for downgrade only of MP51.007F.B03 and does not work for further EFI firmware releases, but for sure is possible with BootROM Reconstruction for whatever version.