Always enable debug (in config/config.php of site directory) before sending me error page.
Always backup your database before update. You can use phpmyadmin to export database.
if you want to disable emoji for server add flag=0 to your app Config. eg, ?flag=0 or ?clash=1&flag=0
if get this message on composer update do as below
cd /www/wwwroot/tld.com/public
chattr -i .user.ini
rm -rf .user.ini
cd /www/wwwroot/tld.com
php composer.phar update -n
cd /www/wwwroot/tld.com/public
chattr -i .user.ini
rm -rf .user.ini
cd /www/wwwroot/tld.com
php composer.phar update -n
go to github, read the update info before you come asking me say questions over and over again. Do not just run update command without reading and come back to make complains.