Hi there,
Are you currently using X or Pro? If you are using X, kindly make sure you have updated to the latest version of X as well when you update Cornerstone.
As for Pro, you do not need to update Cornerstone as it is already embedded on Pro so when you update Pro, Cornerstone will also be updated.
On X / Ok - took latest backup - now with you around, taking the courage to upgrade X first… and then if fine, take another Backup, then Upddate Cornerstone. It has failed us and crashed several times… so taking these steps. Thanks for being around - will keep you posted in a bit. Thanks! 
Hello @team-d,
Thanks for updating thread. 
Sure, let us know how it goes.
Also, are you attempting to update on a staging server or live website? It’s better to perform the update process on a test server, as in case of some issues together we can troubleshoot the same without affecting the live website.
Once update process is completed, either you can copy and replace old website with updated one or you can perform the update on the live website too.
Thanks.
Ok did it in live server. Upgrade to X 6.0 was success - site was up
Update from Plugin 1.3.3 made it fail. Now site down - downtime acceptable for a quick fix. How to fix please help asap.
says: is currently unable to handle this request.
HTTP ERROR 500
Thanks, Prashant & Jade
Folks - can you prescribe a remedy in the same lightening 
speed you responded before. If server access is needed, please just ask. Site is down… and counting on your support team for first real rescue in 4 years being exposed and referring to your product !!
Hello @team-d,
Thanks for updating thread.
Most often 500 error is because of lack of available memory. I suggest you to increase memory limit by editing your wp-config.php file which can be located under the root of your WordPress installation and then try again.
Add the following lines into that file.
define( 'WP_MEMORY_LIMIT', '512M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You can add it before the line
/*That's all, stop editing! Happy Blogging. */
Another option is to upload Cornerstone files manually via FTP using programs like Filezilla. To upload latest version of Cornerstone file, please follow the instructions in following tutorial. Please scroll down to Manual Updates section.
To get started with Filezilla, FTP in the context of WordPress, please take a look at following tutorial:
Note: It’s a humble request not to add new replies after you have updated the thread as it pushes down the ticket back into the queue which increasing the response time.
Thanks.
Hi Prasant - Appreciate your reply. Doesn’t fix the matter. updated this and Restarted the entire server - still same issue. Ensured Cloudflare is in DEV mode right now.
Created credentials to invite you to come help fix - hope you can asap as site is down and want to achieve this upgrade today. Thank You
Hello @team-d,
Thanks for updating thread.
Please confirm the login details as it’s not working on my end. I tried to open the IP address you shared but it redirects for a different website (using X Theme). I tried to access the admin section of that website but it’s not working.
I tried the same credentials to access FTP but there seems to be some issues with the login information. In that regards, please share WordPress admin and FTP login details in a secure note.
In my previous reply, I suggest you one ore method to update Cornerstone manually. Have you tried that?
Thanks.
Appreciate this collaboration. Only SFTP and SSH Access to this Application using the credentials provided
wp-config.php is in public_html
cannot access the site upon applying this plugin - including /wp-admin so don’t know how to manually update. said - Plugin installed successful and then all went down.
Hello @team-d,
Thanks for updating thread.
I am still unable to FTP. I have recorded a screencast that you can take a look. Link shared in secure note.
Please take a look at the tutorial shared in the thread wherein I suggested you to increase memory limit to manually update Cornerstone. Sharing the link again. If you can access FTP then all you need to do is navigate under /wp-content/plugins/ directory and either delete or rename existing Cornerstone folder. Next step is to create a new folder by same name. Download and unzip latest version of Cornerstone (link shared in secure note) and upload the files under the Cornerstone folder you just created.
Please scroll down to Manual Plugin Update Via FTP:
Thanks.
Did all the steps - same HTTP ERROR 500 . when the cornerstone was removed (renamed) and the new was not uploaded the site was accessible with messed up displays. Upon upload of the new folder - again inaccessible.
Your SFTP access has been verified - so you are welcome to come in. Used the same credentials to archive and update from the S3 link. Thanks
Update 2hrs later: restoring the old server settings now…since we don’t need downtime. Please propose a more effective solution. restored
Hello there,
I’ve upgraded your X theme and Cornerstone versions to the latest one and can see the HTTP 500 error.
Can you share to us your Wordpress User/Pass in a secure note so we can take control of your Cornerstone setup?
As of the moment, please don’t touch anything on your WP folders as the new versions of X theme and Cornerstone are still there to fast process the investigation of this problem.
Thank you.
Here is the username and password
Hi There,
I have tried to login to your WordPress back-end but I couldn’t.
Also it seems that you have changed FTP credentials (see secure note).
Could you please check your server’s error log and see what has been recorded. Also make sure to use a PHP version 5.6.x or higher to avoid incompatibility issues.
Let us know how it goes.
Thanks!
Verified its PHP5.5… can upgrade to 5.6 if you’d like, please do convey. we were able to login when the Web credentials were supplied to you earlier. Lets fix this with your esteemed support. So far we stuck with access issues…
SFTP credentials work, to reconfirm - which we just tested it is:
Hi There,
I was able to login to your SFTP and I upon investigating, it seems that your issue is generating from one of the 3rd party Cornerstone plugins that you’re using (wp-content/plugins).
Please rename those directories to disable those plugins temporarily.
For example OLD_cornerstone-modal
Then delete your current Cornerstone plugin and install the latest version which you can locate under (x/framework/plugins/).
This should resolve your issue. Also we do recommend to use PHP 5.6.x or later to avoid incompatibility issues.
Let us know how it goes.
Thanks!
Removed all the old cornerstone folders, and updated to the one you mentioned.
Site works - Dashboard HANGS
More questions:
a. the 4 folders/plugins are already encompassed in new cornerstone folder?
b. The x/framework/plugins/ has an old cornerstone .zip file circa 2015
c. Also we see you created x_2 folder - can you come in and clear up
This is turning into more trial and error effort despite your involvement…
Hi There,
a. Those plugins that you’re using are 3rd party plugins which are not compatible with later versions of Cornerstone.
b. To get the latest version of Cornerstone.zip plugin, simply download X theme from your Envato account.
c. I did not create x_2 folder, however I see that you have X folder which is the correct theme directory. You can safely remove x_2.
Thanks!
Your advice is leading us in circular loops and multiple server restorations… Updated everything, disabled everything… now what to do… can you just do it!
Bottom line is: upon disabling all you said, renaming, and updating cornerstone the site goes down and shows HTTP 500 error
27 mins later: No matter what the update to 3.2.2 takes the site down and only option is to Restore from backup. All other updates were instituted and see functional… All the other no themeco cornerstone were deactivated and renamed.
After committing all this time, can’t help but to wonder,
If you guys for you realize that this was given up a year ago as we didn’t want headaches…and perhaps its a bug in the code. There was reason we didn’t update from 1.3 to higher because this kept happening.
Hi There,
I have checked your back-end by enabling the WP_DEBUG mode on your wp-config.php file and I saw the errors are throwing from Cornerstone plugin due to missing or corrupted files.
define('WP_DEBUG', true);
Then I have tried to login to your back-end and it seems you have disabled login credentials.
Since you’re working on a live site, it is harder to debug your issues without affecting to downtime. If possible, create a staging environment using the copy of your live site so that we can look into this further. You can go through the our migration guide here for that (https://theme.co/apex/forum/t/cornerstone-content-builder-migration/126/1).
Thanks!