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Repair guides and support for 21.5" Intel iMacs by Apple.

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Reboot loop with mojave Patch tool

I’ve got a mid 2010 21.5” iMac. I installed Mojave with the patch tool provided by Dosdude1.

Since then my iMac keeps rebooting over and over again. And I could not do an Internet recovery mode for some reason so I took out the SSD, cloned it from another Mac and reinstalled it. Still the same problem. Did a PRAM reset and this came up (see pic)

Block Image

Problem not solved.

Any ideas?

Answer this question I have this problem too

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Did it flash the EFI chip (firmware update)? What version did you use?


Of the patch tool? 1.2.3, SHA1:57cd15435e42ad8928ae3ff8f5a45033a0ed1d9e (the latest one)


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I ran into the same issue and was not able to remedy it unfortunately.

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Yeah, guess I got greedy. Should have stuck with high sierra...


you're not greedy, you're ASPIRATIONAL


SOLVED! So, finially I cloned the old harddrive from another iMac (with El capitain)since I was thinking that maybe it had to do with the missing OWC (the lose fancable), maybe with the OS system itself. I also changed the memory from 16 (4x4) to the original 8 gb. And it worked. And after a bit of troubleshooting I realized the problem was the internal memory. Don´t know if there was something wrong with them or what but now the iMac is running. Will try to change the HHD to an SSD and keep the old memory because now it should work. YEAH!


Thanks for sharing! Can't wait to try it


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holger eriksson will be eternally grateful.
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