What Blast Mode does, is the complete opposite actions to the hard-sleep mode widget. That is:
1. Bumping the CPU to 500 1150MHz using the ideal profile and conservative governor.
2. Raise the brightness of the screen to the MAX.
3. Turn off offline mode, and silent mode
4. Turn on all connectivity methods, Wlan, 3g (I only set my phone to 2g)
5. Turn on BT (don't know how it is useful, but I just set it to suck more battery power )