GUIDE How to Install macOS Big Sur on Unsupported Mac Pro [MacPro3,1, Mac Pro4,1 and MacPro5,1]

[QED]

I appreciate your very detailed walk through, however I have a similar question to one asked previously, but not quite answered:

Are any of the steps in this process non-reversible?

I have a 2008 MacPro (new to me) that I am in the process of trying to bring up date (as close as I can get) but would like the option to boot to any of the previous OS versions. (I am clean installing each OS on a separate, empty, 500Gb hard drive, such that I can physically swap them to get back to a previous, clean OS.) I am unclear if any of your process is actually updating firmware (which I assume is not reversible) or just changing boot-time software that would simply not be there after swapping the drive back to the previous one. (Note that I have not yet installed OpenCore; just considering it.)

Hopefully this is not too stupid of a question. I have had many macs, but this is the first foray beyond the officially supported path. I am trying to weigh the risks to my shiny "new" classic mac pro.

 

[EliteMacx86]

I appreciate your very detailed walk through, however I have a similar question to one asked previously, but not quite answered:

Are any of the steps in this process non-reversible?

I have a 2008 MacPro (new to me) that I am in the process of trying to bring up date (as close as I can get) but would like the option to boot to any of the previous OS versions. (I am clean installing each OS on a separate, empty, 500Gb hard drive, such that I can physically swap them to get back to a previous, clean OS.) I am unclear if any of your process is actually updating firmware (which I assume is not reversible) or just changing boot-time software that would simply not be there after swapping the drive back to the previous one. (Note that I have not yet installed OpenCore; just considering it.)

Hopefully this is not too stupid of a question. I have had many macs, but this is the first foray beyond the officially supported path. I am trying to weigh the risks to my shiny "new" classic mac pro.

This guide does not involve any firmware flashing or upgrade.

 

[Alexfresneda]

Read here:

The Golden Guide to Flashing Graphic Cards

The Golden Guide to Flashing Graphic Cards Update March 2011 Ok, this thread is a bit old, and some things here are no longer important. For example, you can now generate automatically a 4870 / 4890 firmware in Zeus tool. I will still leave the old text, it has some important facts. But...

forums.macrumors.com

Hello, I would like to install BigSur but it happens to me like MackTheKnife33, when I restart I get a black screen, I have the Radeon RX 5700 XT 8 GB, I have read that the card must be flashed. I have entered the link you put and most of the examples are on Windows systems, is there the possibility of flashing from Mac? How to flash so that the black screen does not appear. Thank you very much.

 

[EliteMacx86]

Hello, I would like to install BigSur but it happens to me like MackTheKnife33, when I restart I get a black screen, I have the Radeon RX 5700 XT 8 GB, I have read that the card must be flashed. I have entered the link you put and most of the examples are on Windows systems, is there the possibility of flashing from Mac? How to flash so that the black screen does not appear. Thank you very much.

I think there is a way using SSH. What's your Card manufacturer?

 

[Alexfresneda]

Creo que hay una manera de usar SSH. ¿Cuál es el fabricante de su tarjeta?

Radeon RX 5700 XT:





Modelo de chipset: Radeon RX 5700 XT


Tipo: GPU


Autobús: PCIe


Ranura: Ranura-1


Anchura de canal PCIe: x16


VRAM (total): 8GB


Fabricante: AMD (0x1002)


ID del dispositivo: 0x731f


ID de la revisión: 0x00c1


Revisión de la ROM: 113-D1820501-101


Metal: Compatible, familia de funciones macOS GPUFamily2 1


Pantallas:


BenQ PV3200:


Resolución: 3840 x 2160 (2160p/4K UHD 1 - Ultra Alta Definición)


Aspecto de la IU: 3840 x 2160 @ 60 Hz


Profundidad del framebuffer: Color de 30 bits (ARGB2101010)


Número de serie de la pantalla: E9J02272SL0


Pantalla principal: Si


Duplicado: Desactivado


En línea: Si


Rotación: Compatible


Ajustar brillo automaticamente: No


Tipo de conexion: DisplayPort


Televisor: Si

 

[EliteMacx86]

Radeon RX 5700 XT:





Modelo de chipset: Radeon RX 5700 XT


Tipo: GPU


Autobús: PCIe


Ranura: Ranura-1


Anchura de canal PCIe: x16


VRAM (total): 8GB


Fabricante: AMD (0x1002)


ID del dispositivo: 0x731f


ID de la revisión: 0x00c1


Revisión de la ROM: 113-D1820501-101


Metal: Compatible, familia de funciones macOS GPUFamily2 1


Pantallas:


BenQ PV3200:


Resolución: 3840 x 2160 (2160p/4K UHD 1 - Ultra Alta Definición)


Aspecto de la IU: 3840 x 2160 @ 60 Hz


Profundidad del framebuffer: Color de 30 bits (ARGB2101010)


Número de serie de la pantalla: E9J02272SL0


Pantalla principal: Si


Duplicado: Desactivado


En línea: Si


Rotación: Compatible


Ajustar brillo automaticamente: No


Tipo de conexion: DisplayPort


Televisor: Si

Several manufacturers make RX 5700 XT. What's your manufacturer?

 

[Alexfresneda]

Varios fabricantes fabrican RX 5700 XT. ¿Cuál es su fabricante?

Además, revisa tu bandeja de entrada.

RADEON

 

[Alexfresneda]

RADEÓN

AMD

 

[EliteMacx86]

RADEON

AMD

For example, if you have RX 5700 XT, which is made by AMD, Sapphire, GIGABYTE, MSI, AsRock, Power Color, etc.

Also, do you have any specific use? Boot screen is really not required once you configure OC.

 

[Alexfresneda]

For example, if you have RX 5700 XT, which is made by AMD, Sapphire, GIGABYTE, MSI, AsRock, Power Color, etc.

Also, do you have any specific use? Boot screen is really not required once you configure OC.

Gigabyte Radeon GV-R57XT JUEGOS OC-8GD​

I need the boot screen to select the usb auto-installer, I have installed BigSur, when I restart I press the key to change boot and it stays black, the monitor does not start and I do not see anything.