Site completely gone after version rollback

[Zedster]

Okay since I could not get an answer to my question I was instructed to rollback.  The rollback stopped with an error and now the site is gone and inaccessible.

 

Any help would be so nice.

 

EDIT: ok the shop comes back after a couple minutes but it says all of combinations are not available.  And this does not fix my problem of wanting to upgrade the system.

 

 

Edited May 9, 2016 by Zedster (see edit history)

[RuthMoore]

all of combinations are not available >> Now all combination is not worked?

[Zedster]

OK the current status is I have rolled back to a previous backup that my webhost had.  Where everything should just work but now the back end seems to work fine but the front is completely gone showing error 500.  The error the server side shows is 500 Error - Premature end of script headers: index.php.  This seems o be an error with many possible causes. My expertise is nonexistent in this area so I am lost.

 

I have however been offered some help from a 3rd party and I hope to get that started soon. 

[RuthMoore]

Hope you resolve this problem soon. 

 

BTW, I have experience with failed upgrade and my solution is install a fresh site then use a Prestashop migration tool to import all data, images etc, to new site.

You can try this way.

Edited June 15, 2016 by RuthMoore (see edit history)

[musicmaster]

Try to regenerate the .htaccess file. (under Prefences->SEO&Urls: save the scheme of urls section.