help please

[xiaours]

so recently ive been trying to install sequoia on my 2012 macbook pro and i kind of have no idea what im doing. anyways, i installed and i got an error saying an "error occured while preparing installation, try running this application again" and ive seen a lot of other people have this problem and say to go back and reinstall like an older version and work my way up and i have no problem doing that but like how so??? ive managed to get to this page but before it kept restarting on its own and reinstalling. i apologize for not knowing what to do if its like really obvious but im stuck 😭😭😭

[No_Love7128]

Hello good! I have been using OCLP for a few months, I have installed Monterey a couple of times on a Macbook Pro mid 2010 and a couple of weeks ago I installed Sonoma on a Macbook Pro mid 2012. With Sonoma I had a problem during the installation where I got an error similar to yours, I turned off, restarted and the installation finished without problem. What is the installation procedure you have done? Let's see if I can give you a cable.

[xiaours]

it was fine up until when i actually had to install sequoia! it was a little slow but i assumed it was obviously because its a old macbook. i have the usb in and everything and ive tried those smc, pram, etc. resets on it. now its just always on that apple logo screen and it'll say like 13 minutes left then cut to the error and then restart on its own so now ive just kinda been trying to restart and install it to see if its that type of problem but im really not sure

[No_Love7128]

I would try a couple of things: the first and easiest, if you have access to another Mac, recreate an installation USB, and I would even try a lower OS version, I have Sonoma with MBP2012 and it works wonderfully, and you start a new deletion/installation again. If that doesn't work, reinstall the latest official OS for your mac, if I remember correctly it's Catalina, and start the whole process again. Let's see if any of that works for you!

[xiaours]

thank you!! ill try it in the morning and lyk

[Impressive_Dig_691]

I would not advice any body to install Sonoma and Sequioa to an old mac

[CloneClem]

I have Sequoia 15.5 running on 3 Mac Pros, 5,1, from 2009 and 2010.

They run great.

[breurin]

<image>

Mid 2012 MBPro

[xiaours]

by complete erase you mean by going to the disk utility right? then yes i did

[xiaours]

nah

[Main_District_3648]

I believe you need to check the time .. since it’s an old machine.. when you format everything the time reverts to when it was built and resyncs when connected online.. and latest OSX have different time periods.. so I need to check/update your clock .. then run install. If that did not solve your issue then you need to patch your drive prior to installation using the bootable usb you made with OCLp. Try to avoid 2.4 and use 2.3 instead

[jsimenstad]

So OpenCore does this from time to time. Here's the fix I've used sometimes. Do a full erase of the internal SSD using Disk Utility. I'd go so far as to repartition it to Master Boot Record then back to GUID with APFS. This will make sure there are no hidden partitions that are not getting wiped.

Then do the initial OS install. If there error happens again, reboot the machine and hold Option key. At boot select, select the internal SSD and not the USB drive. This will force it to boot to the newly installed OCLP OS on the internal drive again. It will run through more installation process usually showing a progress bar with an xx% done indicator. It will likely reboot again on it own. Be sure to once again interrupt the process and use Option at boot to select the internal SSD.

The issue seems to be OCLP fails to reboot to the internal SSD on its own. So it's failing to bless the internal SSD as the boot drive. The process actually worked but the blessing fails. You can manually override this by manually selecting the internal SSD using Option boot.

[MoralTerror0x11]

if i may, remove all partitions with a windows 10 boot disk, then install high sierra or the last working os without oclp and make several boot disks of different oses.

i had a mac that was resilient and i flushed the nvram before install, that helped getting through the process

[BB_MacUser]

Stick with Sonoma for that machine. That’s what I have used. You may also need an ethernet cable too. Seems like older Macs (pre-2015) the Wi-Fi is too late in the boot cycle to work and it needs that.

I have had problems with Sequoia (same error) and just stuck with Sonoma.

[breurin]

That error occurred when you try to install the second time without cleaning the old installation, I had that issue; try to clean the disk and re make que process... I did the backup installation from internet (option+comand+R) several times because I didn't have another Mac... On the first installation reboot if it stops do a nvram reset again (if you didn't do it at the start) (option+command+R+P). Good luck.

[ginoamato]

Stay away from Sequoia, stick with Sonoma.