Hi there ?
I got a problem with an A1989 (2018) throwing various errors when trying to install any macOS than High Sierra. When I try to install it with app store I get an error message "application is damaged". If I try it with my install flash stick I get the error message like on the picture (Flash stick is good. Been using it for many installations this week). High Sierra seems to work fine (except missing keyboard backligh) - I also can install updates for High sierra here. I got the MBP connected to the internet via thunderbolt so connection should be stable.
No history known about this board. Might be possible that someone swapped the LCD earlier.
What I already tried:
- unplugged anything except screen (using external keyboard an mouse)
- install it out of safe mode
- restore with DFU
- SMC and PRAM reset
- download big sur as dmg
now I'm running out of ideas ?
Thank you and greetings
I got a problem with an A1989 (2018) throwing various errors when trying to install any macOS than High Sierra. When I try to install it with app store I get an error message "application is damaged". If I try it with my install flash stick I get the error message like on the picture (Flash stick is good. Been using it for many installations this week). High Sierra seems to work fine (except missing keyboard backligh) - I also can install updates for High sierra here. I got the MBP connected to the internet via thunderbolt so connection should be stable.
No history known about this board. Might be possible that someone swapped the LCD earlier.
What I already tried:
- unplugged anything except screen (using external keyboard an mouse)
- install it out of safe mode
- restore with DFU
- SMC and PRAM reset
- download big sur as dmg
now I'm running out of ideas ?
Thank you and greetings