After the installation of macOS Monterey on an old MBP 2015 - No bootable device or Internet Recovery Mode starts the installation process (macOS Sierra / High Sierra / Mojave)... only the macOS Utilities?!
Hello, I can't longer install an older clean macOS version(High Sierra - Mojave - Catalina) on my old MBP 2015 after the installation of macOS 12. The bootable USB/FW devices launch only the macOS Utilities but not the installation process. The installation doesn't work... crashing?!
It is possible to start the Internet Recovery Mode(CMD-R and SHIFT+CMD+OPT-R)... macOS Utilities but the macOS Sierra installation failed again "Recovery server is damaged".
The only working installation via bootable Device or Internet Recovery(OPT+CMD-R) is macOS Monterey. I also set the date of the MBP to 2017-01-01 and the macOS Installation file to 2017-01-02 via the terminal without success again.
Any ideas?
TIA
Simon
Earlier Mac models