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We have a dedicated guide for that: Updating PrestaShop.
PrestaShop is very easy to uninstall:
- Delete all of PrestaShop's files and folders using your FTP client.
- Delete all the
ps_tables from PrestaShop's database, using phpMyAdmin.
You will lose all information registered to your store: customers, orders, invoices, products, etc.
This cannot be undone, unless you have proper backups of all your data.