Big Sur installation failed
Hello, I tried to download and install macOS Big Sur today on my 2017 MacBook Air, it started to download for a while but then it freezed, I restarted my MacBook, tried to download it again, it says installation failed with a yellow exclamation mark! I even factory reseted my MacBook and installed macOS Catalina again and tried to download Big Sur again but nothing changed. please help!
MacBook Air 13″, macOS 10.15