This will remove all the log files, download the newest version of the qortal.jar:
cd && cd qortal && ./stop.sh && rm qortal.jar && curl -L -O https://github.com/Qortal/qortal/releases/latest/download/qortal.jar && ./start.sh
Go to the How To Bootstrap & Delete The DB page.
If you’d like, you can simply replace the core and db (to bootstrap) all in one command. A bootstrap is a download of a database that is updated every 12 hours so that you only have to sync the remaining blocks from the latest bootstrap creation. You will notice several 0-100% processes during the popup screen, then you will need to wait for it to finish synchronizing which will continue after the popup has closed::
cd && cd qortal && ./stop.sh && rm qortal.jar && rm -R db && curl -L -O https://github.com/Qortal/qortal/releases/latest/download/qortal.jar && ./start.sh
To update the UI, open the UI. If there is an update available, you'll see a notification like the screenshot below:
Followed by the screenshot below, where you'll have the option to restart now or update upon closing the UI:
If you have admin access to your router, you should configure port forwarding for the QORTector. Refer to the Port Forwarding page on how to do so.
Go to the How To Reduce Bandwidth page.