MP 1,1-5,1 OpenCore Legacy Patcher Not Booting

[EvanJ1]

I have a early 2009 Mac Pro running Mojave (via dosdude). I had successfully installed Monterey 12.3.1 onto a disk partition using OpenCore Legacy Patcher. However my second monitor was not working in 12.3.1 in so I erased the partition and the USB drive with disk utility, And made a new USB installer with an older OS 12.2.1.

BIG MISTAKE

Now I can not get the boot picker to show up when I hold restart holding down the option key It just boots into the regular OS.

I tried to made another USB install disk for 12.3.1 but now it will not boot off that anymore either. I tried 12.4 as well as zapping the PRAM by holding down COMMAND-OPTION-P-R. Still no Mac Boot Picker. What could I do to get it to Install again? Thanks!

 

[Macschrauber]

It would help if you give more specs. GPU (with or without native bootscreen), firmware, what kind of SSD/HDD etc etc.

you should install a supported system like Mojave (if you have the proper 5.1 firmware for it) to setup from scratch.

 

[StefMacPro]

It would help if you give more specs. GPU (with or without native bootscreen), firmware, what kind of SSD/HDD etc etc.

you should install a supported system like Mojave (if you have the proper 5.1 firmware for it) to setup from scratch.

Sorry, if I interrupt. I can also make a new threat, if necessary. But I thought I ask here first, because similar topic.

So, does that mean, if I want to upgrade to Big Sur or Monterey by open core legacy patcher, I should do the firmware update from 4.1 to 5.1 first?

Or can I also upgrade OS with the patcher, and do the firmware update later?

The reason why I'm asking... I would like to upgrade CPU and DIMMs later, but would love to upgrade OS now.

I have an early 2009 Mac Pro
El Capitan version 10.11.6
2 x 2.93 GHz Quad-Core Intel Xeon
32 GB 1066 MHz DDR3
1 TB SATA Disk (50% free space)
NVIDIA GeForce GTX 680 4095 MB (without native bootscreen, but would change back to ATI Radeon 5770 for firmware update)

 

[tsialex]

Sorry, if I interrupt. I can also make a new threat, if necessary. But I thought I ask here first, because similar topic.

So, does that mean, if I want to upgrade to Big Sur or Monterey by open core legacy patcher, I should do the firmware update from 4.1 to 5.1 first?

Or can I also upgrade OS with the patcher, and do the firmware update later?

The reason why I'm asking... I would like to upgrade CPU and DIMMs later, but would love to upgrade OS now.

I have an early 2009 Mac Pro
El Capitan version 10.11.6
2 x 2.93 GHz Quad-Core Intel Xeon
32 GB 1066 MHz DDR3
1 TB SATA Disk (50% free space)
NVIDIA GeForce GTX 680 4095 MB (without native bootscreen, but would change back to ATI Radeon 5770 for firmware update)

You need to cross-flash to MP5,1 firmware first. If you update first, you can't cross-flash.

Btw, dump your current BootROM image with ROMTool BEFORE cross-flashing.

https://forums.macrumors.com/threads/macpro5-1-bootrom-thread-144-0-0-0-0.2132317/post-30767973

 

[StefMacPro]

You need to cross-flash to MP5,1 firmware first. If you update first, you can't cross-flash.

Btw, dump your current BootROM image with ROMTool BEFORE cross-flashing.

https://forums.macrumors.com/threads/macpro5-1-bootrom-thread-144-0-0-0-0.2132317/post-30767973

Ah, thanks a lot! I guess you saved me a lot of time and trouble. 😅
Thank you!!!

 

[max95100]

Sorry that I am writing in the wrong section, but I have a similar problem only on macbook air 4.2 from 2012.
I had monterey installed via OCLP, I was also using linux from a usb drive. After the last monterey update, my system crashed and booted to recovery (lion) I also deleted the entire partition and installed lion. Now I can't boot into the system and it keeps booting into recovery. After changing the drive from Monterey to a linux drive I am able to boot linux, unfortunately holding down the "alt" key does not bring up the boot option.
Can I somehow restore my computer to factory settings?