Doesnt work becouse you need a Trucha able sys-IOS!
Without you cant boot Rescue Discs!!
I say that the Drivechip and the Savemii dongle was totally useles in case you cant unbrick your Wii.
Only a original with a higher FW update on the disc than your installed one can unbrick your Wii but your on 4.2 now and games with FW 4.3 or >> will properly come next year.