Problems after upgrading from Mountain Lion to Mojave

Bummer, that ***** , try again ? I do recommend getting Winclone Pro to easily backup/restore your bootcamp if this happens. Are you on Mountain Lion ? Or Are you doing a clean format and install to High Sierra ?

It seems to be that I have been doing the best thing by keeping OS that came with computer on main drive with bootcamp, and use an updated version of macOS on an external drive... it has miraculously removed my headaches.

I recommend use another computer, or boot up with an OSX on an external drive...and then backup bootcamp with Winclone Pro before doing anything else.... I am sorry that Mojave has put you through all this nonsense and unnecessary computer diddeling.

Here is a thread about

"This partition map modification would make a Windows partition unbootable "

i am sorry you are experiencing this nightmare.. I do recommend backing up your bootcamp before doing anything else.

(P.S if you dont have a windows 7 install + license find one, cant post more about that due to copyright circus and its circus clowns, but first ask Microsoft.. and if that does not go well, perhaps from friends/people you know IRL they might have spare unused copies lying around)

Ok, yes there has been time Machine Restore issues with Majove (Apple has a lot of debugging to do with Majove and drives, as everything else works ok in it)

Since Tascamworks in High Sierra , High Sierra is probably your best bet (you could have remained on OSX Mountain Lion and install and boot off an external drive with Sierra for websites and stuff)

Now looking for a place to download High Sierra How to upgrade to macOS High Sierra - Apple Support

No. 4 Is Download macOS High Sierra.. ignore the Mojave bit and go here

(If you still need macOS High Sierra, use this App Store link: Get macOS High Sierra.)

get it before it disappears, as Mojave is being recommended.. and it is a matter of time as Mojave gets all the bugs ironed out the High Sierra download option would gradually disappear.

I hope this helps.

^_^

Ah Apple,. why do they have to make things complicated.

I did some searching, try this link

https://itunes.apple.com/gb/app/macos-high-sierra/id1246284741?mt=12

Yep you would have to erase/reformat Mojave off and install High Sierra , install that on, and then use your time machine backup ... [or you can install mountain lion, restore time machine, and then upgrade to high Sierra (not to 100% sure about this one, but worth a try but is the best in restoring and then getting updated.)] , the most likely one that would work is reformatting, installing High Siera and get restore Data from Time machine, most likely be an import restore rather than a full restore as if you would with Mountain Lion.

If I can remember I had a Sierra install file stashed away offline, and managed to upgrade by clicking in in Mavericks, so thereticly the best way to retain all your stuff, is to install Mountain Lion, and do Time Machine Backup, and then run the High Sierra installed, make sure you set drive in options to HFS+ instead of APFD (as Apple still needs to do a lot of work on their new file format, to have less issues.)

Looks like you experienced the drop/disappearing partition like I did when I installed Mojave on an external drive. This is because of the new format system, APFS, and Apple handling it poorly when introducing it for used Macs with previous OS's and those who dual-boot. I would suggest to create a bootable USB Mojave drive (with restore partition), and then use disk utility in that to first aid the drive, and your Mojave partition would re-appear and become readable, and your mac will become bootable again, but the restore partition built in might have also been dropped, and would remain a grey spot.

Did you make a time Machine before backup ? Always backup with Time machine before updating, adding partitions or using operating systems on external drives for the first time, just as a precaution. You will feel more confident and safe that your data/work/software etc is safe even when all **** brakes loos.

If you did, you can reformat drive, reinstall Mountain Lion, and restore your time machine contents back. and decide if you wish to upgrade that to High Sierra (if you want to be up to date with most stable updated version of macOS) instead...(unless you are like me with GUI usability issues) stay on Mountain Lion and have Mojave installed on an external SSD you plug in USB. Also note you wont be able to read APFS Mojave drive from Mountain Lion

(hoping someone makes a third party driver to read from all previous versions of macOS)

Install Mojave on an external drive if you really need to use Mojave (i think you do for an updated Safari and iTunes to synch with iOS11/12 devices) if you wish to keep your main drive safe for the time being. Don't switch boot in startup disk in system preferences, else you would have the same loosing a partition experience again.

Power machine off, stick in drive with Mojave on,turn on and then Boot by pressing alt to load boot selection menu(if you have a firmware password, enter it first before getting boot selection menu), and select your Mojave drive that way and to get into Bootcamp.. system preference start up disk selection would cause issues of the Mojave partition vanishing again, with the need to run first-aid on disk utility again.

Or you can stay with Mojave with the drive you first aided using the Majove startup disk you created , and keep it handy, also note you wont be able to read your Mojave drive from bootcamp without third party drivers that you are forced to pay for , because apple did not make a read driver when making APFS mandatory with the Mojave upgrade.

yeah the recovery partition vanishes... when the OS vanished, and you managed to recover the OS partition with first aid in latest disk utility. I have not tested audio software yet. What software do you use on it ? Logic ? I am aware that Apple updates Logic and Garageband to be compatible with newer versions of it's OS

" Restore they don't contain any valid OS." Is this restoring from time machine in Mojave or Mountain Lion ?

Well the partition got deleted, you would have to redownload Mountain Lion and install it.

If your audio software cannot run in High Sierra Install high Sierra on other or External drive), and install High Sierra on an external drive/another drive and dual-boot Mountain Lion with Sierra on external drive for browsing the web with latest version of safari(for security) and other things such as if you enabled two-factor authentication (which mail, iMessage, FaceTime become completely useless up to Mavericks , and work in Yosemite and up), and keep Mountain Lion productivity. Try testing the audio software in high Sierra, on friend's mac first before making a final conclusion of having main drive on High Sierra.

Its a pleasure, and thank you.

What a bummer, they should have the option available to downgrade , like the time period of 2 weeks to a month for people who have issues. Some people upgraded with no issues (except for no Bootcamp read driver, and Time Machine backups/restores with Mojave has been buggy).

O.k maybe create a another drive partition in Mojave (if you wish to try and keep it, but I doubt it would retain its partition if you dual boot via system preferences) But Its best not to keep Mojave on the same disk/drive in a separate partition, as you could loose data working between the two OS's which is why it would work a little better and a bit safer if you had Mountain Lion and Mojave on separate hardware drives.

Yes Mountain Lion installer wont read the partition because of the APFS format, and Apple's older systems cant read APFS except for High Sierra and Mojave..

If you Used option 2 you would need

1) to erase drive,

2) format partition to Mac OS Extended (Journaled)

3) and then install Mountain Lion on, then run time machine backup to put all your things back to the way they were... and

4) then Upgrade to High Sierra.

Thank you, at least you are getting this problem sorted and fixed.