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The error ERR_CONTENT_DECODING_FAILED means your site is saying that the pages are compressed but they’re not (or not properly compressed).

Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.

See http://www.wpbeginner.com/plugins/how-to-deactivate-all-plugins-when-not-able-to-access-wp-admin/

Please do not post duplicate messages. Thanks.