Updating to Joomla 3.10 breaks the website

Hello yes the check if website is J4 is wrong
The above suggested fix should be correct
i am testing the fix

Replacing
3.9.99
with
3.99.99

You guys are great!  Thank you responding to the community!!!  This is just a quick solution I found.  I do not claim to be an expert on the code inside FlexiContent!
But this temp fix is at least necessary to access the back-end so the new fix can be applied...otherwise the site is fully broken and it would be impossible to upload a new package or use the module updater.

Yes for earlier update need to édit the file
WE will create a FAQ content to explain it

Hello

Unfortunately for all broken websites the only way to fix is a manual edit
Only if Flexicontent v3.3.11 is install prior to Joomla update ,  then next manual fix will not be needed

To fix website


1. Edit File  administrator/components/com_flexicontent/definecontants.php

At line 63, replace 3.9.99  with 3.99.99 

if (!defined('FLEXI_J40GE')) define('FLEXI_J40GE', version_compare( $jversion->getShortVersion(), '3.99.99', 'g' ) );

2.  Go to Extension/Manage Database and click Fix
3. Then upgrade to FC v3.3.11

The FC-Update (through the J-updater) works fine, thanks a lot!

Tnks, manual editing works fine!