2/10/2024 0 Comments Instaling Sierra![]() The solution was just to copy this file correctly again and everything works! The problem was that the bootable usb device I created had one file badly copied. I had signature check issues when installing sierra using a bootable usb device. Also I want to thank the authors of the memtest tool without which I would not have been able to fix it on my own. I felt compelled to write this to help folks out there who may save some time reading this experience of mine. I replace the RAM with a new 4G pair (8G total), and sure enough the memtest passed with that new RAM, and deleting the downloaded macOS Sierra, and re-downloading, and re-installing worked ! I have never come across such RAM errors in any of the computers I have owned before (i have used more than 20 computers over the years) - and would have never believed it, since, the mac mini appeared to be running fine in spite of those RAM errors ! I had upgraded the RAM from 4G to 8G many years back. Finally, I downloaded the fantastic and free "memtest" application for the mac, and sure enough it found many RAM errors !. So, I tried to do a "hardware test" as the Mac booted (hold down the alt-d keys), and the mac gave out a wierd error code. Deleting the downloaded file, and redownloading the file did not fix it either.Īfter much frustration, I came across an article in Reddit which indicated RAM error to be a possible cause. Setting the date which was one of the suggestions - did not fix it. I have a mac mini (mid 2010) and was trying to upgrade from yosemite to sierra, and hit this problem. My conclusion was, for some reason the downloaded file dmg image was not complete, however, because the installer launcher is a separate program so you won't get the error message until the installer unpack the dmg.Īs a side note, I did try verifying shasum and md5 result as suggest by few others in this thread but I've got different results so that may imply the checksum method may not apply everyone. I Googled round for a while and came to this thread trying few suggestion mentioned here but no luck.Īt the end, I deleted the previous downloaded installer and re-download through AppStore (Search "Sierra" then click Download, make sure you have deleted the previous downloaded copy of Sierra installer) and then install from that copy and bingo, it worked for me. ![]() My first attempt to install Sierra on my MBP15 Mid-2010 was through AppStore by clicking the Update button on the big banner, it was able to download the media but few minutes after the installation process started it returned me the error message "The installation payload failed signature check". So would like to share here hope can help anyone who has similar case as mind. My situation was a bit different from you guys but I managed to solve it. Video of El Capitan Internet recovery issue: I have tried installing using a different USB port. I have used the El Capitan installer terminal set the correct system time. I use the installer Disk Utility to format the Macintosh HD partition. The computer is a mid-2015 15" MacBook Pro. The computer does have Windows 10 installed on to a Bootcamp partition, and that seems to work fine. ![]() I'm guessing there's no restore partition. The second Apple support guy I talked to said to do a regular restore (CMD+R), but it always goes to internet recovery. It just keeps doing that for hours and hours. ![]() The count-down timer gets to 0, then goes back up to ~30 minutes. The problem there is it tries to install El Capitan, but never completes. The first Apple support guy I talked to said to do an internet recovery. I have tried recreating the installer USB stick with a fresh download. This leaves the computer without a bootable version of macOS. I've tried doing a clean install of Sierra multiple times, and every time, the installer gets to the end and then shows the message "The installer payload failed signature check".
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