1) Purchase the NEC Update from CI
2) Once you receive the NEC Update chip, you need to install it in your ElectriCalc Pro:
a) Turn calculator off.
b) Remove the battery.
c) Using a screwdriver, pop out the square tab located in the middle section on the back of your calculator.
d) Replace it with the new Update tab by inserting it into the slot.
e) Replace the battery door.
f) Turn calculator on. Your calculator is now updated and ready to use.