- Casio FX-CG20 (Prizm)
- 30 Jun 2017 11:55:00 pm
I've just got hold of a used Casio FX-CG20 calculator but I want to change the Owner, Company information BUT it's password protected. I've hunted the Web and can only find answers like Casio or your retailer have to do it, and I also found a solution (which doesn't work) involving holding down 3 keys whilst pressing on the restart button on the back which would need a contortionist to operate it! Is there no hard reset buried somewhere, the reset to Factory Default still leaves the previous owner. Any help would be appreciated.