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    If you have to upgrade your Magento version from 2.1.7 to 2.3.4 then follow the below steps.

    Note: Please take the backup of your existing database and take a full backup.

    After taking backup follow the below upgrade steps on the Magento root directory using the terminal.

    Step 1 : php bin/magento maintenance:enable

    Step 2 : Take backup using existing composer.json of your site’s Magento root folder

    Step 3 : composer remove magento/product-community-edition –no-update

    Step 4 : composer require magento/product-community-edition=2.3.4 –no-update

    Step 5 : composer require –dev allure-framework/allure-phpunit:~1.2.0 friendsofphp/php-cs-fixer:~2.13.0 lusitanian/oauth:~0.8.10 magento/magento-coding-standard:~1.0.0 magento/magento2-functional-testing-framework:~2.3.14 pdepend/pdepend:2.5.2 phpunit/phpunit:~6.5.0 sebastian/phpcpd:~3.0.0 squizlabs/php_codesniffer:3.3.1 –sort-packages –no-update

    Step 6 : composer remove –dev sjparkinson/static-review fabpot/php-cs-fixer –no-update

    Step 7 : Open composer.json and add the below line in “autoload”: “psr-4” section in last.

    Step 8 : composer update

    Step 9 : php bin/magento cache:clean

    Step 10 : rm -rf var/cache/* var/log/* var/page_cache/* var/session/* var/view_preprocessed/* generation/* pub/static/*

    Step 11 : php bin/magento setup:upgrade

    Step 12 : php bin/magento maintenance:disable

    Thats it.

    Now clean the cache and check your Magento version. It should be upgraded to 2.3.4

    Fill the below form if you have any Magento programming need.

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