If you have to execute maintenance on your own Qlink Legend 250 then it will always be recommended to have a Workshop Manual to keep just for a reference in the event that you need to know the way to take out a certain part like the Brake Discs and fit it again accordingly.
Qlink Legend 250 Workshop Manuals are able to offer specific diagnostic details for your car so if something is faulty it helps you find out what the issue is and easy methods to correct it. After that you can evaluate if this can be achieved by yourself or that the job is simply too big you can actually make a reservation for your Legend 250 into a suitable friendly mechanic.
Qlink Legend 250 manual