Early 2011 model, A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor.

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Update sierra with no battery, only ac adapter.

So I just formatted my mac OS version 10.7.5.Downloaded sierra and launched it. Computer restarts and everything goes smoothly until.... "your computer is not connected to a power source ".

My ac adapter is attached but I have no battery installed, I intend to buy a new one soon enough but, I need to work in the mean time so.... Anyone could help me out?

Answered! View the answer I have this problem too

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Hello barrosvictor25,

Reset the SMC and try again with lovely sierra!

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Hi it almost worked.... Now it says the installer payload failed signature check. :( what does thateven mean?


Hi again! So it appears that my date and time were wrong after smc reset. So i corrected it and the update is going normally. Thanks for the answer, peace!


You are welcome! :-) enjoy new OS,


Hi Barros, did u ever get your Macbook Pro Sierra back to full clock speed? thanks!


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Did all suggested including date reset via Terminal but obstinately refuses to install Sierra :-(

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barrosvictor25 will be eternally grateful.
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