install manually from this link https://developer.apple.com/download/all/?q=command%20line%20tools solved my problem

i couldn't find the original post - thanks that person- manually install from that link solved my problem https://developer.apple.com/download/all/?q=command%20line%20tools

nothing worked for me, until go to VSCode(IDE APP), and ios/App/App.xcodeproj/project.pbxproj that file , and searched EXCLUDED_ARCHS = arm64; and delete that line, i did same thing from xcode, like go to target>build settings, exclude arc thing and deleted arm64 from there, didnt worked before, but deleting from VSCode worked , weird

My problem solved with delete arm64 from target>build settings>Excluded Architectures. Actually i deleted from there before, but actually worked when i go to my VSCode and go to ios/App/App.xcodeproj/project.pbxproj file and searched EXCLUDED_ARCHS = arm64; and delete from there, and worked, i dont know why my update at xcode did not worked but VSCode worked xcode 12.0.1, iOS 14 pack updated, and all capacitor stuff updated for 2.0.4 (latest one)