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Cp Os Downgrade


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#1 ECE

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Posted 04 November 2011 - 07:52 PM

Hi,

I'm having a problem with my touchscreen; it is not working.

I suspect that it may be a SW issue regarding OS 3.06. I tried to use an earlier OS "v3.05", but the calc refused to accept the downgrade.

I extracted the OS3.05 "CPOSDATA.BIN"file. What I'm trying to do is change the OS version in that file to a higher one (for example v3.07) and update the calc with that file.

Unfortunately, I can't find the OS version in the file. Can anybody direct me to do so?

Regards :)


Edited by M.Yasser, 04 November 2011 - 07:57 PM.


#2 MicroPro

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Posted 07 November 2011 - 06:30 AM

Hi. As far as I know, no one has been able to do that. As an old post in this forum says, "you want to find the offset of 6 in memory and change it to 7" ? Weird idea.
For the ClassPad, I've just seen a hacked updater for a previous version, but I've never encountered a hacked ClassPad OS. I don't know even if anyone planned to hack it.

As for the touch screen, mostly ClassPad 300 PLUS are facing problems with it. in the previous posts I have recommended many people to change batteries, reset their calc, connect their calc to PC in the middle of touch screen operation, etc -- and I was wrong to suggest these all.

Have you tried to contact CASIO support or repair center in your country?

#3 ECE

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Posted 07 November 2011 - 02:49 PM

Hi MicroPro,
Thank you for your reply.

you want to find the offset of 6 in memory and change it to 7

This information is not clear to me, can you explain it further?
I found 2 locations in the“CPOSDATA.BIN” file for different versions (v3.05, v3.06 and v3.061000) and altered these versions but the updater refused to update the OS.

As for the touch screen, mostly ClassPad 300 PLUS are facing problems with it

I thought that the HW of CP300Plus and CP330 are identical. Is there any difference?

Have you tried to contact CASIO support or repair center in your country?

No, I bought My CP several years ago from another country.
I know that it is possible to change the OS version for the fx9860G and fx9860GII. Maybe we can do the same for ClassPad? I’m trying to but with no success.
Regards.

#4 MicroPro

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Posted 09 November 2011 - 01:13 PM

This information is not clear to me, can you explain it further?
I found 2 locations in the“CPOSDATA.BIN” file for different versions (v3.05, v3.06 and v3.061000) and altered these versions but the updater refused to update the OS.

Where the numbers in hex or plain-text?
There might be a number of other places to change too. Maybe there is also a checksum that should be recalculated.
The version is most probably both hardcoded into the updater executable and checked by the on-calc updater as well.

I thought that the HW of CP300Plus and CP330 are identical. Is there any difference?

We don't really know. No one tried to compare them.

I know that it is possible to change the OS version for the fx9860G and fx9860GII. Maybe we can do the same for ClassPad? I’m trying to but with no success.

Unfortunately unlike fx and Prizm, little work is done on discovering ClassPad secrets. I remember one or two topics about that here a very long time ago (2003 or so). I, like you, have no information about it.

However, I remind you of the dangers of this and strongly recommend everyone not to try downgrading or anything. By trying this you can fully destroy your poor ClassPad (which previously only had touch screen problems).
As we know, the OS 3.0 update makes substantial changes to the ClassPad's bootloader (which I don't know whether it lives on the bios or the flash, or wherever else) This might be the case with any OS version so partially changing some part in the OS Update and flashing it can make harmful changes to the ClassPad...

Enough lecture... :greengrin: Gonna hex-edit the files and look what's in them though; looks interesting.




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