Are you migrating from TXSeries 5.1 to 8.1 or 8.2?
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TXSeries is quite an old version that went out of support in 2009. This blog lists the steps you need to follow for moving to the latest TXSeries version.
The upgrade from TXSeries 5.1 to 8.1 happens along with associated software upgrades. As as first step, you need to go through the supported operating environment (SOE) page for TXSeries 8.1 or 8.2 and plan your associated software installations. You can access the page through this link
Once your supported software versions are in place, you can follow the steps provided in the topics under the "Mig
Once the migration of regions is complete, kindly go through these additional links mentioned below:
3.1) As TXSeries 5.1 being a very old version, there are few additional post installation steps to be performed which is documented in this DCF link
3.2) There are few behavioral changes specific to TXSeries 8.x that is documented in this KC page: htt