To troubleshoot a Brother Printer offline error follow the below given steps:

a.       Ensure that there is a secure connection between your computer and printer.

b.      Power off both devices, then turn them back on. Check if the printer is powered on without any error messages.

c.       Update the printer drivers to the latest version.

If the problem persists, refer to the Brother Printer manual or contact their customer support for precise troubleshooting steps.