To flash V2 firmware, use EFILive Explorer (EE) goto the F12: Firmware tab.
V7.5.6.115 is basically the same but provides updates/fixes.
V8.1.2.95 provides updates to black box logging/flashing and V2 firmware.
You should install both V7 and V8 since some earlier versions of V7 won't work with later versions of V2 firmware.