Startpage is redirected to /home after upgrade to v8.2

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Hi,
my colleague just hit the upgrade button - v7.5.4 to v8.2.1 - without reading any system requirements nore backing up the system. He said the upgrade stopped due to PHP not running on the required version. After upgrading PHP to 5.6+ there are still some bugs.

First of all my startpage is redirected to /home. Is there any way to turn this off?

How can i roleback concrete 5 to the prev version?

Best regards
jstahl