I tried so many things....it felt like i'm going from rabbit hole to rabbit hole.
I started with following a guide to modify the Windows7-only Bootcamp assistant from ElCapitan so that it would proceed to partition the hard drive and would at least TRY to make a bootable USB drive from the recent Windows10 2009 build but that failed (supposedly) because of being the install.wim of being more than 4GB.
I messed around with formatting the USB drive as ExFat but that wouldn't be recognised as bootable neither.
I'm having trouble to remember all the things i tried but i remember trying UNetbootin.
I then read a lot about how to make the install.wim file smaller...many ways to archive it. First big rabbit hole.
I tried a solution to create manually a 1GB FAT32 partition and a remaining NTFS partition with the complete content of the .iso file of Windows.
I had to copy certain files to the first FAT32 partition and to create a jumpstarter to the NTFS partition.
That worked and i finally succeeded to boot from the USB drive and the Windows installer initialised but i couldn't install on the partition created with the Bootcamp assistant. That is supposedly because the Bootcamp assistant is creating a hybrid GUID partition table as soon as you partition the drive for Windows and that wouldn't allow the Windows installer to format the Bootcamp partition as NTFS as needed.
I struggle to remember what i did next but i think i followed another guide to manipulate the partition table with gdisk (Opensource utility?) but couldn't get it to work because the SIP were enabled.
The recovery partition were shot on that install so i couldn't find a way to disable it.
I solved that with another guide actually from this forum with updating the recovery partition so i finally could disable SIP and gdisk supposedly fixed the GPT issue.
I then read about that my specific models should boot in legacy BIOS mode to install successfully all the drivers but the USB drive only had the EFI boot so i finally went down a next rabbit hole finding the most recent Windows10 version that would burn onto a single-layer DVD. It turns out the rather recent 2004 build would allow that.
So the DVD route worked right away and i could choose actually between EFI or legacy BOOT from the bootpicker and the Windows installer didn't complain anymore about the Bootcamp partition.The installation finished successfully but a restart doesn't get to a desktop. Bootloop? I don't know!
I then tried to get the verbose mode working but couldn't find the way of doing it. Is it possible (like the old Safe mode key combination at start-up)?
I gave up and wanted to try to start over again but the Bootcamp assistant were kind of stuck so i proceeded to manually merge the Bootcamp partition into the macOS with the DiskUtility but that throw up an error.
I don't know how to go on from now?
I would try to make a backup of the ElCapitan partition and do a completely reinstall with restoring afterwards just to give the Bootcamp assistant another try with a Windows10 iso that will get accepted and create a bootable USB drive...
Should i go that route or try to salvage the mess i left...I have Diskwarrior, would that repair the partition table to start fresh without reinstalling and restoring the ElCapitan install?
I started with following a guide to modify the Windows7-only Bootcamp assistant from ElCapitan so that it would proceed to partition the hard drive and would at least TRY to make a bootable USB drive from the recent Windows10 2009 build but that failed (supposedly) because of being the install.wim of being more than 4GB.
I messed around with formatting the USB drive as ExFat but that wouldn't be recognised as bootable neither.
I'm having trouble to remember all the things i tried but i remember trying UNetbootin.
I then read a lot about how to make the install.wim file smaller...many ways to archive it. First big rabbit hole.
I tried a solution to create manually a 1GB FAT32 partition and a remaining NTFS partition with the complete content of the .iso file of Windows.
I had to copy certain files to the first FAT32 partition and to create a jumpstarter to the NTFS partition.
That worked and i finally succeeded to boot from the USB drive and the Windows installer initialised but i couldn't install on the partition created with the Bootcamp assistant. That is supposedly because the Bootcamp assistant is creating a hybrid GUID partition table as soon as you partition the drive for Windows and that wouldn't allow the Windows installer to format the Bootcamp partition as NTFS as needed.
I struggle to remember what i did next but i think i followed another guide to manipulate the partition table with gdisk (Opensource utility?) but couldn't get it to work because the SIP were enabled.
The recovery partition were shot on that install so i couldn't find a way to disable it.
I solved that with another guide actually from this forum with updating the recovery partition so i finally could disable SIP and gdisk supposedly fixed the GPT issue.
I then read about that my specific models should boot in legacy BIOS mode to install successfully all the drivers but the USB drive only had the EFI boot so i finally went down a next rabbit hole finding the most recent Windows10 version that would burn onto a single-layer DVD. It turns out the rather recent 2004 build would allow that.
So the DVD route worked right away and i could choose actually between EFI or legacy BOOT from the bootpicker and the Windows installer didn't complain anymore about the Bootcamp partition.The installation finished successfully but a restart doesn't get to a desktop. Bootloop? I don't know!
I then tried to get the verbose mode working but couldn't find the way of doing it. Is it possible (like the old Safe mode key combination at start-up)?
I gave up and wanted to try to start over again but the Bootcamp assistant were kind of stuck so i proceeded to manually merge the Bootcamp partition into the macOS with the DiskUtility but that throw up an error.
I don't know how to go on from now?
I would try to make a backup of the ElCapitan partition and do a completely reinstall with restoring afterwards just to give the Bootcamp assistant another try with a Windows10 iso that will get accepted and create a bootable USB drive...
Should i go that route or try to salvage the mess i left...I have Diskwarrior, would that repair the partition table to start fresh without reinstalling and restoring the ElCapitan install?
Last edited: