Delete the line
/home/barbar84/www/wp-conte.../plugins/updraftp.../methods
File: remotesend.php

Dòng [193/510]:
// Note that mod_security can be configured to 'helpfully' decides to replace HTTP error codes + messages with a simple serving up of the site home page, which means that we need to also guess about other reasons this condition may have occurred other than detecting via the direct 413 code. Of course, our search for wp-includes|wp-content|WordPress|/themes/ would be thwarted by someone who tries to hide their WP. The /themes/ is pretty hard to hide, as the theme directory is always <wp-content-dir>/themes - even if you moved your wp-content. The point though is just a 'best effort' - this doesn't have to be infallible.
Fix

Ấn tiếp tục để Delete và ở lại trang, ấn Delete để Delete và quay về List dòng
Function