So my plan would be to reinstall Easy-Installer,
Not convinced reinstall is needed – the last log reflected reality when it said waiting for recovery.
I am guessing that First boot into Recovery is the main issue – many people might do this stage many times before they get it !
change the usb cable
Not convinced this is needed – adb and heimdall are already demonstrated working.
and use Samsung Official to aktivate my gps location
idk, but this sounds like following a “Samsung hint”, I cannot see the necessity.
and then restarting the Easy-Installer again.
ok
the official process with language settings and wifi password will start
ok – if you are still KG Checking, having the phone online with wifi might allow to “check for updates” if asked – might be a good trick to lift KG Checking → Normal.