How to Choose the Best macOS Version for Mid 2015 MBP Issues
The best upgrade is not always the newest release; it is the newest release that keeps graphics, Wi-Fi, sleep, battery and daily apps reliable. Unsupported Macs depend on OpenCore Legacy Patcher root patches, and each macOS release changes drivers, security policy and graphics behaviour.
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
- 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.
- Match macOS to hardware age: 2011-2012 Macs often behave better on Monterey or Ventura; 2013-2017 Macs can usually test Sonoma or Sequoia with an SSD and enough RAM.
- Avoid risky releases for production: Treat macOS Tahoe or any newly unsupported path as experimental until OCLP support is explicit.
- Update OCLP first: Install the latest OpenCore Legacy Patcher, build/install OpenCore, then run root patches after macOS boots.
- Test the real workload: Check browser tabs, Office/Adobe, printing, sleep, Wi-Fi, Bluetooth and battery before calling the upgrade successful.
- Keep a downgrade path: Have a USB installer for the previous stable macOS before upgrading.
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
- The machine boots twice without manual intervention.
- Graphics acceleration and Wi-Fi work after root patches.
- The user apps that motivated the upgrade actually launch.
- Battery and thermals are acceptable for the intended workload.
Rollback
- Restore the previous macOS from Time Machine.
- Reinstall the older stable release with OCLP.
- Keep data on a separate backup before experimenting again.
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
- OpenCore · OCLP · EFI · kexts · config.plist · macOS troubleshooting
Original Question: "Mid 2015 MBP Issues"
So I bought a Mid 2015 i7 MBP and went through the OCLP up to Sonoma 14.7.5 and everything was great for a few weeks until this morning.
The system is really sluggish and not doing simple things like displaying the wallpaper.
It is also saying I can take the OTA update to Sequoia.
Questions
- Any reason why is should just go off a cliff performance wise
- I have uninstalled the last few apps I added just in case (GDrive add-in and Sheets\Docs)
- Can I take the OTA or would I need to go through the OCLP path for Update to Sequoia to see if it would fix it?
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Alternative / Duplicate Questions Resolved:
- "Nvme issues on macbook pro 2015":submitted by /u/Parking_Ad4914
Just upgraded my mac os to sequoia using opencore on my 2015 macbook pro. Im using a 1tb ssd to dualboot macos and linux. It usually works fine, but other times it refuses to load and just stays stuck on the loading screen. any help would be great.
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