Its only can be done in store..
Start the game,
1. find the store,
2. Type the amount of credit,
3. Buy some ammo
4. Search the last value of credit.
5. Repeat step 3-4 until you find your credit value and change to what ever u want.
Do the same method for power node.
- type amount of power node u have.
- buy power node.
- search again
- bla.. Bla, bla, u know it..