Global changes in 856 field

Good afternoon,

We have identified an error in 856 fields of our database:

The URL should be: http://190.144.54.58:8080/newgenlibctxt/Archivos/TextoCompleto/0940.pdf

However, now when you click on the link to the full text, the URL that is redirected:

http://190.144.54.58:8080/newgenlibctxt/Archivos\TextoCompleto\0940.pdf (note the "\" characters)

We need to edit all 856 fields to replace "\" characters to "/".

¿Can you guide us on this issue?

This is our OPAC URL: http://euinfocentre.co/
This is the ISBN from the example record: 9789292040048

Thank you very much!