Setup error
If i want setup my Sierra OS mac find the next error: A helyreállítási szerveren a telepítési információk sérültek. The time is good, other problem is. (Macbook Air 2017 - Sierra OS) Thanks for answer!
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Google translation of "helyreállítási szerveren a telepítési információk sérültek":
"the installation information on the recovery server is corrupted"
Am I to assume you are trying to reinstall macOS from Recovery Mode (Command + R) or Internet Recovery Mode (Command + Option + R, or Command + Option + Shift + R)?
If so, then maybe you need to set the computer's date to an earlier date in case the certificate for the installer has expired which has happened on even older macOS online installer). To do this, you will need to launch the Terminal app from the Utilities menu while booted to the macOS installer and use the following command to change the date to Jan. 2, 2018 @ 11:33am:
date -u 0102113318
If no errors, then quit the Terminal app and select "Reinstall macOS".
Another option would be to create a bootable macOS USB installer using the instructions in this Apple article, however, you will need access to another Qualifying Mac if this laptop is not able to boot macOS on the internal drive:
Create a bootable installer for macOS - Apple Support
A Qualifying Mac is one which is able to run the OS you are trying to create....although the Qualifying Mac can be running any version of macOS. For example, a 2017 MBAir is compatible with macOS from 10.12 to 13.x. This means you can generally use a Mac from Late 2009 to 2018 to create a bootable macOS 10.13 High Sierra USB installer. Or you can use a Mac from 2021 to 2022 to create a macOS 13.x Ventura installer. You can use the following article to see which versions of macOS are compatible with various Apple hardware to determine whether you have another Qualifying Mac:
https://eshop.macsales.com/guides/Mac_OS_X_Compatibility