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Odoo is evolving rapidly with new features to increase the productivity of any organization in various ways. That is why 'Odoo Upgrade' is one of the most attractive services provided by Odoo SA.
To Upgrade your Odoo to the next version, there are two main areas for consideration.
Odoo SA can Upgrade your older version of Odoo database to the newer version of Odoo. You need to subscribe for enterprise contract to be benefited for this service: https://www.odoo.com/buy
You can see database Upgrade process from the following Link: https://upgrade.odoo.com/database/upload
2. Code Upgrade
You have two options: A. Contact Odoo SA B. Contact Odoo Partner / Service Provider
A . Contact Odoo SA
Odoo SA can be helpful to upgrade your customized Odoo modules:https://upgrade.odoo.com/module/upload
B. Contact Odoo Partner / Service Provider
Odoo Partner can also help you out for code Upgrade.
Let me share the process which need to follow for code migration.
Setup environment for older version on local and test machine
Get an older version of Odoo code from Github.
Get the customized code for an older version of Odoo.
Create the new database and install all custom modules.
Check and test all functionalities (Specially those who requires migration).
Take a general overview of all modules' (standard + custom) functionalities.
Get the document / overview from the client to understand older versions' customized code and their functionalities.
Prepare test cases related to all functionalities.
Setup new environment to start code migration
Get code for the latest version of Odoo.
Setup online coding environment where we will push migrated modules' code.
Do code migration of the module one by one.
Get the list and priority of the modules to be migrated.
Get the document which describes complete functionalities of a current implementation.
Get the older version of the production database and check those modules' functionalities with real data.
Once code migration will be completed, get the migrated database of a newer version and test with the migrated code.
Test all use cases on pre-production database and make sure all functionalities work fine.
If the issue is related to code migration then it will be fixed by Odoo Partner (Service Provider).
If the issue is related to migration script then we can ask Odoo SA to fix it and get the latest migrated database
Once all issue will be resolved then do final migration for production
Send database to Odoo SA for final migration (for production)
Once we have the final migrated database for production than we can proceed for final go live with a new migrated database.
Complete user training and start working on upgraded version of Odoo.