Best way for upgrade my Odoo 9 community with personal modules to Odoo 10/11/12?

Question

Hello everybody, I would like to know the best way for upgrade my Odoo9 community to Odoo 10/11/12 and my personal modules, I never upgraded Odoo so I don't know how begin, anyone could advice me? Thanks!!

Yenthe Van Ginneken (Mainframe Monkey) · Accepted Answer

Hi Jorge,
At the moment you have two 'easy' options. You can upgrade through upgrade.odoo.com or through OpenUpgrade.
If you want upgrade your Odoo V9 to V10/V11/V12 and have an enterprise version or want to buy an enterprise version Odoo will upgrade your database for free. You can find more information about this at  https://upgrade.odoo.com/database/upload  [1]
Alternatively, if you don't have an enterprise license and you do not want one you can use the open source alternative OpenUpgrade. O

Sameer Ahmad · Answer

Hi,
Before upgrading, if you have changed the views via UI or if you made code level changes in community or enterprise edition files then you will lose all the changes made.
If you have created separate modules for your needs and the code is not in the community or enterprise folders then you can move ahead. Because once you upgrade the whole code is overwritten with new one.
Upgrading is just simply pulling the latest commit of odoo from github and making appropriate changes such as in config

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