There may be not only one solution for filament jam. You can follow the steps to clarify the problem.
Remove the hotend to check if the filament can be extruded without the hotend. If the filament can be extruded, re-install the hotend push the temperature at least 250°C. Then extrude the filament with 10 mm/s of speed.
If the filament cannot be extruded without the hotend, remove the filament cutter mechanism and check the filament hole if it's clean or not.