Wrong Wire

YOUR MISSION, SHOULD YOU TO CHOOSE TO ACCEPT IT, IS TO DIFFUSE FOUR DEADLY BOMB DEVICES FOUND AROUND OUR CITY, EACH MORE INTRICATE AND DANGEROUS THAN THE LAST.

BOMBS
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Four devices have been found and each poses a different challenge:

1. Six sticks of dynamite with a simple four colour detonator.  Study the field notes carefully, and be sure not to cut the wrong wire!
2. A block of military grade plastic explosives, with a nine digit keypad on top. Use digital codebreaking tools to analyse the microprocessor inside and figure out the code before you run out of time.
3. A complex briefcase  bomb left behind by a dead terrorist, packed with enough explosives to bring down the whole tunnel. A numeric keypad, a fingerprint scanner, and a cell phone that nobody wants to hear ringing.  Take it slow and disable the device one layer at a time - no guts, no glory!
4. [REDACTED] A forgotten cold-war era atom bomb, armed and primed to detonate.  Protected by laser trip switches, the core contains the most elaborate detonator yet.  Use all the skills you've learnt to stop it before tens of thousands of civilians pay the price!

TOOLS
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1. Wire Cutters. The ultimate and final tool for bomb diffusal.  Just be certain before you make the cut.  HINT: they don't only cut wires.
2. Drill. Open up those interior compartments - just be very, very careful with it
3. Serial Port Interface. A tool for intercepting data messages sent between components
4. EPROM reader. A microprocessor debugging tool that lets you directly inspect the memory on a chip
5. Flash Writer. Attaches to any memory chip and overwrites the contents with whatever the operator desires.

Secondary objective
Uncover the hidden polaroid revealing the identity of the evil mastermind behind these devices.

One final word of warning. Don't touch the lasers!