Hi,
I´m trying to downgrade a CASIO Prizm calculator but I can´t seem to find an answer for it. I saw somewhere that by pressing the F2-4-AC/ON and Restart once the calculator was turned off, I would be prompt to a black screen so I then I would press 9 and install the OS. But nothing happens. Currently the calculator is in version 3.1.02
Thank you in advance
How to downgrade CASIO Prizm fx-CG20?
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SuperXX
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Re: How to downgrade CASIO Prizm fx-CG20?
Hi.
You just need to put the calculator in "OS error" mode using the F2-4-AC combo, and it'll then accept any OS version.
The combo is just very tricky :
You just need to put the calculator in "OS error" mode using the F2-4-AC combo, and it'll then accept any OS version.
The combo is just very tricky :
- press and hold the restart button on the back
- without releasing it, press and hold the
F2
4
AC
keys - without releasing these 3 keys, release the restart button
- now only release the
F2
4
keys together - wait a second
- now finally release the
AC
key - press and hold the
9
key - wait a second
- release the
9
key - press and hold the
×
key
You should now get the OS ERROR screen. - release the
×
key
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critorAdmin
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Re: How to downgrade CASIO Prizm fx-CG20?
It worked. Thank You. I didn´t have the correct key combination
-
SuperXX
Niveau 7: EP (Espèce Protégée: geek)- Messages: 66
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