According to my modder, my Wii has the D2E and he installed the D2pro9 V3 (2.3/1.6) latest firmware, I have a ribbon at the side of one of the USB port which is for connecting to a jtag programmer for rewriting the whole chip if needed, that is my understanding but you better wait for the pro here to confirm this.
During my research period, D2pro9 v3 (2.3/1.6), Wasabi v3 and Wiikey 2 are the best for D2C/D2E, I chose the D2pro9 because
1) Support track record
2) ability to rewrite whole chip if needed
3) My modder recommended it
Most of all it works at least for me.