I tried to symbolicate an iOS crash report sent from Apple.
atos -arch armv7s -o APP_BINARY_PATH 0x0006a23c 0x35000 + 217660
And I got below er
You need to use the atos version that is part of Xcode. You can find it here: /Applications/Xcode.app/Contents/Developer/usr/bin/atos
/Applications/Xcode.app/Contents/Developer/usr/bin/atos