My way to get this update installed:

- Factory Reset
- Flash I9300XXBLG8_I9300OXABLG8_I9300XXLG8_BTU.zip with Odin (Hotfile)
- Flash XXLH1 with Odin (modem.bin from CWM version in this thread)
- Install CF-Root 6.4
- Install CWM Touch
- Full Wipe
- Changed updater-script (See OP)
- Installed OTA through CWM
- Full Wipe