The memory bump doesn’t go into a .htaccess file in wp-admin. It goes into the .htaccess in the webroot. Use FTP to find and delete the .htaccess file you put in wp-admin.
Then forget about .htaccess files and try adding the line below near the top of your wp-config.php file, a few lines after the opening <?php define('WP_MEMORY_LIMIT', '64M');
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