Even with a perfect macossierra10126frenchiso , users encounter issues. Here are the fixes:
: Compatible with MacBook (Late 2009+), iMac (Late 2009+), MacBook Air/Pro/Mini (Mid 2010+), and Mac Pro (Mid 2010+). Important Notes macossierra10126frenchiso
The installer says "Ce logiciel ne peut pas être installé sur cet ordinateur." (This software cannot be installed on this computer.) Solution: You are likely on a Mac newer than 2017, or the system date is incorrect. Sierra rejects installations if the system clock is set after 2019 (due to expired certificates). Open Terminal from the Utilities menu and type: date 0101010117 to set the date to 2017. Even with a perfect macossierra10126frenchiso
: Exit Disk Utility and follow the on-screen prompts in French. 3. Creating a Bootable USB (macOS) iMac (Late 2009+)