Can't install OS X Mavericks and Yosemite on iMac late 2013?

Question

iMac

Hello! I have an iMAC late 2013. I don’t know what OS it came with from the factory, but right now it has El Capitan on it. The task was to put Mavericks on it or, in extreme cases, Yosemite. I made a bootable flash drive using the "createinstallmedia" command, as in the instructions on apple.com, I boot from it and see a prohibition sign - a circle crossed out by a strip. I try the same thing with a Yosemite flash drive - the same thing. But reinstall El Capitan - please! The flash drives are definitely working, because the older iMAC 2010 is loaded perfectly from them, it seems the year of manufacture. I tried to completely kill the partition on the hard drive, recreate it, format it, reset NVRAM - it does not help. I conclude that El Capitan prescribed something somewhere and now iMAC does not allow to put anything, except for "Captain".
Colleagues, has anyone experienced something similar? How to force this iMAC to install Mavericks? Thank you!

Answer 1

It goes from the factory to Mavericks, you don’t need a flash drive, you need to go into the CMD + R recovery utility at startup, there you need to demolish all disk partitions (including the recovery partition) through the disk utility, after making a backup copy of everything important, after after you delete all partitions from the hard disk - reboot and again CMD + R, you will have to wait, it will download the recovery utility from 10.9, as soon as it downloads - you start the installation there, then you can already upgrade to 10.10 through the AppStore.
Also, be prepared for the fact that a copy of TimeMachine will not be able to deploy on an older version of the OS when downgrading.