To install the updater without a PC, use the feature in FBI: Open FBI on your 3DS home menu. Select Remote Install → Scan QR Code .
: Some community members created repacks of LumaUpdater with updated internal URLs to fix the 404 errors found in original builds, essentially extending the app's life after the original developer stopped active maintenance. luma+updater+26+qr+code+repack
A "repacked" version found on a forum, obscure file host, or YouTube video description usually implies: To install the updater without a PC, use