High Sierra booting possibly corrupts newer Systems. Fix, description and a boot picker renamer

[Macschrauber]

The original should work with any folder. Shouldn't matter if its on an ESP or not. What's the problem? Error message? Is it not storing a .disk_label file?

IIRC it was something with processing disk image, just wanted to repeat the glitch but could not replay it. Tho I am at Mojave atm.

 

[Macschrauber]

I guess MBP11,1 is 2014 which is newer than my MacPro3,1 (2008) and therefore has code to display .disk_label image instead of just "EFI Boot".

For OpenCore, there's a setting bit OC_ATTR_USE_DISK_LABEL_FILE for PickerAttributes to make it use .disk_label image instead of .contentDetails text.

Yes, my 3.1 just "ignores" .disk_label icons for ESPs, too and I made some icons to distinguish ESPs.
The Mac Pro 5.1's firmware renders the .disk_label file.

Edit: tried the original makemultilinedisklabel in Monterey and it worked, too for ESPs.

Mac Pro 5,1 firmware 144.0.0.0.0 with multiline .disk_label for those ESPs.

 

[Ausdauersportler]

Late to this party, but this bug and a fix is known since 2021 when Big Sur hit the road using a new APFS implementation unknown to High Sierra.

IMHO you can avoid this problem completely when running High Sierra on an HFS+ disk.

 

[Macschrauber]

Late to this party, but this bug and a fix is known since 2021 when Big Sur hit the road using a new APFS implementation unknown to High Sierra.

IMHO you can avoid this problem completely when running High Sierra on an HFS+ disk.

thanks, will add this to reference.

A HFS+ disk has no separate Preboot Volume so it can copy nothing from it to nowhere :]

back on topic:
Do you have an idea, why changing the dates like

sudo touch -t 203009110327 /System/Library/CoreServices/SystemVersion.plist
sudo touch -t 203009042358 /System/Library/CoreServices/PlatformSupport.plist

prevents High Sierra to bork the other OS' Preboots?

Since I did it no more hits on other Preboots.

btw:
The Dumper package is also on Github btw, with a document about this topic also:

Macschrauber-s-Rom-Dump/Rename_and_repair_preboot.md at main · Macschrauber/Macschrauber-s-Rom-Dump

A tool for dumping and analysing Mac firmwares. Plus flashing for Mac Pro 4.1 / 5.1 - Macschrauber/Macschrauber-s-Rom-Dump

github.com