Ohhhh you don't need to make an original one, firstly the ROM you're using whether its stock or custom. Download the same ROM to your desktop, open the .zip and extract the build.prop file from it.
Once extracted, boot your device into recovery, and then use the following command.
adb push /path/to/file/build.prop /system
If it doesn't allow it you may need to mount it as read write.
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