Cannot open the lift glass or tailgate, how do I open it manually?

Hello,

Can you hear the actuator make noise when you try to use the switch?
Then it may be that the linkage has come unhooked or broken

You will need to access the boot from inside the vehicle.

A short video
https://youtu.be/w_KwoFfPa7M

Endgate Trim Panel Replacement

Removal Procedure

Open the endgate.
Remove the screws that retain the inside handle to the endgate.
Remove the endgate inside handle from the endgate.
Remove the screw that retains the endgate trim panel to the endgate window latch support.
Remove the screws that retain the endgate trim panel to the endgate.
Remove the endgate trim panel from the endgate:
6.1. Release the retaining clips from the upper edge and the sides of the trim panel.
6.2. Lift the panel up in order to release the tabs along the bottom edge.

Installation Procedure

Install the endgate trim panel to the endgate.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Install the screws that retain the endgate trim panel to the endgate.
Tighten
Tighten the screws to 1.9 NÂ m (17 lb in).

Install the screw that retains the endgate trim panel to the endgate window latch support.
Tighten
Tighten the screw to 1.9 NÂ m (17 lb in).

Install the endgate inside handle to the endgate.
Tighten
Tighten the handle to 2.8 NÂ m (25 lb in).

Hope this helps.

Cheers, Boris