This copy of the install OS X El Capitan application can’t be verified

Posted on September 1, 2020 by admin

Today I had to reinstall another OS X on a MacBook pro and I was using the same installation USB flash drive created as showed in the previous post and today I got the message "This copy of the install OS X El Capitan application can't be verified".

After some research I found the following fix.

It seams that the problem was with the date. So, before you start installing the OS X, open terminal and type "date MMDDHHmmYY" where

MM - 2 digit month  01 - 12
DD - 2 digit date   01 - 31
HH - 2 digit hour   01 - 24
mm - 2 digit minute 01 - 59
YY - 2 digit year   > 15

This fixed my problem and I was able to install OS X El capitan.

How to reinstall OS X without original Apple ID and password

Posted on August 20, 2020 by admin

This week I received an iMac 27" late 2009 that doesn't have internet recovery and I had to reinstall OS X without original Apple ID.

First step is to download a compatible OS X installation file on a working Mac computer and then create a bootable flash drive.

The OS X can be downloaded from this loation and also follow the instruction of creating a bootable media.

In my case I had to download and install OS X El Capitan and I had tho use the following command in Terminal to create the bootable flash drive.

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app

After entering the command you will have to enter the computer password and press Y key to confirm that you want to erase the flash drive.

When you see "done" message in terminal, the flash drive is ready and can be removed from the computer.

Next step is to connect the drive to the iMac late 2009 and boot from it by pressing options at startup. Select the newly created flash drive and install the operating system.

How to install Server 2019 Standard on Dell T340 server

Posted on August 19, 2020 by admin

In order to install Server 2019 Standard, first you have to download the server standard 2019 ISO file and create a bootable flash drive or burn it on a dual layer DVD.

It took a while to create a bootable flash drive and after I finally was able to create it, when I was trying to boot from it I was unsuccessful. So I had to find a workaround.

I took a USB flash drive with a bootable Windows 10 installation and boot the server from it and in the same time I connected the other USB flash drive that had the files to install windows server 2019 Standard. After booting from the first flash drive, I opened the command prompt and navigated to my drive that had the installation files for the Server OS and run the install.exe file.

The next problem that I run into was that the install didn't recognize my drives that were setup in RAID 1. I had to download the file SAS_RAID_DRIVER_WS2019_S140_5.5.2-0008_A00_ZPE.exe and extract it. I moved the files to one of the flash drives and installed the RAID drivers on the server.

Afterwards it was just the standard OS install steps.