How to avoid replicating bad Aplet

- User B received a good good aplet via IR from User A.
- User B run aplet and but he accidentally press Cancel.
- It goes into programming mode, he panic and press some keys and managed to go back to Home.
- User B then transmit the "damaged" aplet to User C.
- Now User C try to run the aplet, he gets an error.

User A can run the aplet.
But User B and User C now faces with an aplet that give them "Invalid syntax".

Here is the correct procedure to avoid the above event from happening

I did a factory reset on all the four 39gs. Click here for more information about factory reset.
Did a full diagnostic test on them - just to make sure that the calcs are ok.

Download a good "Curve Area" aplet from the website. Transfer this to
the first calculator.
Without running the aplet, I transfer the "Curve Area" aplet via IR
to all the three calculators.
After that, run and test the "Curve Area" aplet on all the four calculators.