How to Fix Laptop shuts itself off before the installer finishes, with BOOT MISMATCHED message before picker
This mini-guide provides a structural approach to troubleshoot and fix the issue.
Prerequisites
- Confirm your hardware specifications (CPU, GPU, Motherboard).
- Ensure you have a bootable recovery USB and backup your EFI.
Fix Steps
- Verify your network controller model (Intel, Broadcom, Realtek).
- Ensure the correct kext (e.g., AirportItlwm or BrcmPatchRAM) is loaded in your config.
- Clear network interfaces and reset NVRAM if changes don't apply.
Verification
- Reboot and verify if the functionality is restored and stable under typical usage.
Original Question:
I'm trying to install High Sierra on my old Dell Inspiron N5010 laptop, it has the specs as below:
Intel Core i5-480M
4GB of RAM
120GB SSD
Realtek 8103T Ethernet
So I followed the Dortania's guide to create a legacy installer using internet recovery for High Sierra, I managed to get to the recovery, after it finished installing macOS into the hard drive, the laptop reboots itself but ended up with a black screen with a flashing underscore "_" at the top left on the screen, after a few retries, (including erase the hard drive and install again) the underscore is gone, but now, every time the laptop boot up, it will show a BOOT MISMATCHED message, and after verbose, the laptop will enter the Installing into Hard Drive screen, after the loading screen shows about 5-7 minutes left, the laptop will shut itself off, I'm really out of ideas right now, I don't want to go back to Windows, I really wanted to hack this laptop...
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