Free Storage 80103 [exclusive] — Blue Archive Not Enough

If you have your account linked (Nexon ID, Google, or Apple):

If you have >6 GB free, have tried all the steps above, and still see Error 80103, it may be a bug with your specific device firmware or a rare account-specific issue. Contact Nexon support via the in-game inquiry form (accessible from the title screen) and provide: blue archive not enough free storage 80103