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Not sure if this would help anyone but here is my experience from going from Yosemite (Chimera BIOS) to Yosemite (Clover UEFI).
Originally, I had a working Yosemite install with Chimera. Realized that iMessage stopped working and decided to look into a fix and discovered Clover. While I was at if, figured I might as well try the whole UEFI thing while i'm at it. So, followed this guide to the T and tried booting from my USB stick the Yosemite installer (write over the existing system so I didn't loose anything).
Didn't work, couldn't get the machine to boot from USB. Ended up at a grey screen with blue text and boot options that I had no idea about (just knew it wasn't clover). So, tried reinstalling the USB stick and booting again and this time it worked and got black screened. Realized then video was through my mobo vs.my discrete card.
Was able then to install OSX over again on my existing install and rebooted back to my USB stick and back into my desktop where I installed Clover to the HD (again, to the letter). This time, no go. Anytime I tried to boot from hard drive, it would not boot error no media blah blah blah. I could still boot my system from USB though with full network support and audio/etc, so I assumed everything was working right just Clover wasn't booting right. So after days of trying reinstalls and different boot options, I gave up.
So, started doing some more research related directly to the motherboard and see who else has attempted this. Came across a few other guides that had various levels of complexity on getting UEFI booting with Mavericks/Yosemite. Didn't want to bother with that level of complication.
So, I seen the updated guide on here (Tonymac) about Yosemite and Clover install, and noticed a slightly different method of preparation for the USB stick (1 partition, not two) as well as no special BIOS. In fact, it is recommended that Gigabyte boards use BIOS boot over UEFI. So, I had a spare HD with Windows on it and decided to try a clean install on the HD (Still using the BIOS recommended in this guide). Did the same method same USB stick that worked before except this time.. would not boot and would not show up as a bootable device when pressing F12.
So, confused I did the installer again on a different drive and tried again. This time it worked (weird, don't understand why) and was able to install OSX on my spare HD. Rebooted, went through the setup screen and tried to connect to the net... nothing. Didn't know what was going on, worked before, oh well.
Went ahead and put Clover and the kexts on another USB and installed it to the HD and used my working config.plist file. No go, same errors as before no boot media. Tried different methods, nothing. So, tried BIOS install with Clover (something that should have worked no matter what, did before) nothing, same errors. Then, tried from USB... another no go. So, now I have a non-working/booting system, this time with a kernel panic/error I can't find.
Frustrated beyond belief, I take a gamble (i'm not giving up on iMessage at this point, too much invested in Cover/Configurator/research now) and decide to try the standard Gigabyte BIOS (FYI my board is a rev 1.1 board and it's not a beta BIOS). and went with a UEFI install. Did a time machine backup and formatted my drive from scratch
Followed Tonymac's guide this time and booted from USB first time and had OSX Yosemite re-installed. Booted from USB into my new Mac system (could not do a time machine restore on during setup, network drivers didn't work) and installed Clover to HDD with Kexts and the config.plist for injecting nVidia and this time it worked. Booted form HDD via UEFI to my Mac desktop - only thing not working was the onboard sound (solved with Multibeast).
The only thing I can think of that caused all this was the custom BIOS. For some reason, it wasn't holding something in memory between boots and kept crashing the system. Tried to reinstall it a couple of times all with the same result. Wasn't until I went back to the official Gigabyte one that I had success. May be worth trying for anyone still having problems.
Also, if you follow this thread (http://www.tonymacx86.com/general-help/110471-how-fix-imessage.html) iMessage will work great as well. Recommend a newer iMac model and follow the recommendations about generating new UUID's and random 5 digits after the S/N for it all to work right.
Originally, I had a working Yosemite install with Chimera. Realized that iMessage stopped working and decided to look into a fix and discovered Clover. While I was at if, figured I might as well try the whole UEFI thing while i'm at it. So, followed this guide to the T and tried booting from my USB stick the Yosemite installer (write over the existing system so I didn't loose anything).
Didn't work, couldn't get the machine to boot from USB. Ended up at a grey screen with blue text and boot options that I had no idea about (just knew it wasn't clover). So, tried reinstalling the USB stick and booting again and this time it worked and got black screened. Realized then video was through my mobo vs.my discrete card.
Was able then to install OSX over again on my existing install and rebooted back to my USB stick and back into my desktop where I installed Clover to the HD (again, to the letter). This time, no go. Anytime I tried to boot from hard drive, it would not boot error no media blah blah blah. I could still boot my system from USB though with full network support and audio/etc, so I assumed everything was working right just Clover wasn't booting right. So after days of trying reinstalls and different boot options, I gave up.
So, started doing some more research related directly to the motherboard and see who else has attempted this. Came across a few other guides that had various levels of complexity on getting UEFI booting with Mavericks/Yosemite. Didn't want to bother with that level of complication.
So, I seen the updated guide on here (Tonymac) about Yosemite and Clover install, and noticed a slightly different method of preparation for the USB stick (1 partition, not two) as well as no special BIOS. In fact, it is recommended that Gigabyte boards use BIOS boot over UEFI. So, I had a spare HD with Windows on it and decided to try a clean install on the HD (Still using the BIOS recommended in this guide). Did the same method same USB stick that worked before except this time.. would not boot and would not show up as a bootable device when pressing F12.
So, confused I did the installer again on a different drive and tried again. This time it worked (weird, don't understand why) and was able to install OSX on my spare HD. Rebooted, went through the setup screen and tried to connect to the net... nothing. Didn't know what was going on, worked before, oh well.
Went ahead and put Clover and the kexts on another USB and installed it to the HD and used my working config.plist file. No go, same errors as before no boot media. Tried different methods, nothing. So, tried BIOS install with Clover (something that should have worked no matter what, did before) nothing, same errors. Then, tried from USB... another no go. So, now I have a non-working/booting system, this time with a kernel panic/error I can't find.
Frustrated beyond belief, I take a gamble (i'm not giving up on iMessage at this point, too much invested in Cover/Configurator/research now) and decide to try the standard Gigabyte BIOS (FYI my board is a rev 1.1 board and it's not a beta BIOS). and went with a UEFI install. Did a time machine backup and formatted my drive from scratch
Followed Tonymac's guide this time and booted from USB first time and had OSX Yosemite re-installed. Booted from USB into my new Mac system (could not do a time machine restore on during setup, network drivers didn't work) and installed Clover to HDD with Kexts and the config.plist for injecting nVidia and this time it worked. Booted form HDD via UEFI to my Mac desktop - only thing not working was the onboard sound (solved with Multibeast).
The only thing I can think of that caused all this was the custom BIOS. For some reason, it wasn't holding something in memory between boots and kept crashing the system. Tried to reinstall it a couple of times all with the same result. Wasn't until I went back to the official Gigabyte one that I had success. May be worth trying for anyone still having problems.
Also, if you follow this thread (http://www.tonymacx86.com/general-help/110471-how-fix-imessage.html) iMessage will work great as well. Recommend a newer iMac model and follow the recommendations about generating new UUID's and random 5 digits after the S/N for it all to work right.