How to Fix 2016 MBP Stuck on boot up with half filled progress bar During macOS Boot or Installation

guide OpenCoreLegacyPatcher
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How to Fix 2016 MBP Stuck on boot up with half filled progress bar During macOS Boot or Installation

Boot failures need a predictable pass through firmware, USB, storage, EFI and verbose logs before reinstalling macOS. Most installer stalls come from firmware settings, an invalid config.plist, wrong SSDTs, bad USB mapping or unsupported storage/controller settings.

Quick Checks

  • Backup current state: Save a copy of your working EFI and run a full system backup before changing settings.
  • Identify hardware components: Note down your exact CPU, GPU, Wi-Fi card, and motherboard/laptop model.
  • Ensure utility alignment: Keep OpenCore, OCLP, and ProperTree updated.

Fix Steps

  1. Create a rollback point: Make a Time Machine backup and keep a copy of your last working EFI folder before editing OpenCore, kexts or root patches.
  2. Boot verbose: Add -v keepsyms=1 debug=0x100 so the final visible line gives a real clue.
  3. Check firmware settings: Disable Secure Boot and Fast Boot, set SATA to AHCI, disable CFG Lock if possible, and use UEFI mode.
  4. Validate OpenCore: Update OpenCore, Lilu and core kexts, then run ocvalidate or ProperTree clean snapshot.
  5. Recreate the installer: Use a fresh USB installer and try another USB port; older Macs may need a USB 2.0 hub for input during setup.
  6. Reset NVRAM: Reset NVRAM from the OpenCore picker before retrying the installer.

Do Not Continue If

  • Do not continue if: you do not have a working EFI backup, a Time Machine backup, or another bootable macOS installer.
  • Stop and capture evidence: if the machine stops booting, take a photo of the last verbose line before changing more settings.

Verify It Worked

  • Verbose boot moves past the previous stopping line.
  • The installer reaches Disk Utility and sees the target disk.
  • Keyboard, mouse and USB remain active during recovery.
  • OpenCore picker still loads after a cold boot.

Rollback

  • Restore the last booting EFI folder.
  • Use the officially supported macOS installer to recover the machine.
  • Do not erase the internal disk until the installer can boot twice consistently.

Next Action

  • Test now: reboot twice, reproduce the original problem, and confirm whether the same symptom returns.
  • If it still fails: record the Mac model, macOS build, OpenCore or OCLP version, GPU, Wi-Fi/Bluetooth chipset, and the last visible error.
  • Read next: use the related searches below for the nearest OpenCore or OCLP fix before making another change.

Related iATKOS Searches

Original Question: "2016 MBP Stuck on boot up with half filled progress bar."

Hey guys I'm fairly new to Mac Os and OpenCore. After I update to the most recent Sequoia version, OpenCore told me I needed to reboot. Well after it rebooted it has since been stuck on the apple logo with a half filled progress bar. What happen Ed and how can I fix this. I'm very new to this so please don't use acronyms to explain things because I'm unsure what they are. I'd greatly appreciate the help.

submitted by /u/trunksfreak
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Alternative / Duplicate Questions Resolved:

  • "2008 MacBook Boot Stuck on Apple Logo with progress bar half filled after installation.":

    Hello,

    I have a 2008 MacBook that I have installed OCLP on. I created a bootable USB drive and went through the installer for Big Sur. When MacBook rebooted I selected the OCLP EFI and then selected the Big Sur HDD installation. I followed the directions on this page: https://dortania.github.io/OpenCore-Legacy-Patcher/BOOT.html

    After that, I am stuck at an Apple logo with a half filled progress bar. I tried clearing the NVRAM/PRAM by following the instructions at this page, but it didn't help: https://support.apple.com/en-mide/102603

    Any advice on how to get Big Sur to boot?

    submitted by /u/LudeJim
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