Helpdesk: https://helpdesk.qnap.com/index.php?
uninstall qboost
log in to the NAS using putty and follow below steps:
Remove Qboost section in /etc/config/qpkg.conf using the vi command:
vi /etc/config/qpkg.conf
Press "a" to edit and delete the Qboost section (refer to screenshot attached), press "Esc" and "wq" to save and exit.
Do note, this may corrupt the config file and potentially cause the App Center and all applications installed not to function if not done correctly, thus ensure steps are performed correctly to avoid potential issues.