I could really use a way to downgrade 2.55 OS to 2.43 OS, is it possible?
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I don't think Texas Instruments has the older versions avalible for download. You may be able to find someone else who has a calculator with the older version and get it that way.  You would probably have to download a complete backup of the calculator with the older os and in TI Connnect and then restore the backup to the newer calculator.
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