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Which files and folders need to be replaced in the Magneto root folder in order to upgrade Magento 2 Manually?

I am running a stock copy of Mangento 2.3.5 on a Ubuntu 18.04 test server.

I am trying to upgrade from Mangento 2.3.5 to Magento 2.4.1

So far I have installed php 7.4, the required php extensions and elasticsearch 7.6. I have downloaded a copy of Magneto 2.4.1

I know this could be achieved via composer and then using the Magento upgrade command. However, I would like to know how to go about doing this manually, so I could keep track of what is changed and learn the processes that take place during an upgrade.

I appreciate any help that you could provide.

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I mangaged to upgrade manually by extracting Magento 2.4.1 tar.bz2 file within the Magento root directory. This replaced all the necessary files in order to upgrade:

tar -xvf magento-ce-2.4.1-2020-09-25-04-22-45.tar.bz2

I then set the correct permissions within the Magento root directory using these commands:

find var generated vendor pub/static pub/media app/etc -type f -exec chmod g+w {} +

find var generated vendor pub/static pub/media app/etc -type d -exec chmod g+ws {} +

chmod u+x bin/magento

chown -R maguser:www-data .

**(my server username for managing Magento is maguser. Yours will be different.)

Then use the upgrade command:

php bin/magento setup:upgrade

Finally, I re-indexed, cleaned and flushed the cache:

php bin/magento indexer:reindex

php bin/magento cache:clean

php bin/magento cache:flush

Starting from Magento 2.4, 2-factor authentication (2fa) is enabled by default. If you need to disable this in order to access your admin login page, you could do this by issuing the following commands:

php bin/magento module:disable Magento_TwoFactorAuth

php bin/magento cache:flush

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