SIM card insertion
Warning!
When opening the case, be very careful, as it is attached to the base by the 4G antenna cable. With sudden movements, the cable could come off and it would be very difficult to reattach it (slot M of the 4G module)
To insert a SIM card, you need a flathead screwdriver. The SIM must be in nano format and the PIN must be disabled.
- open the case by inserting the screwdriver and levering, first on one side of the AL300, then on the other

- insert the SIM into the left slot (indicated as Main on the cover)

- close the cover starting from the alignment of the USB port profile

- then align the hole for the front button

- press evenly trying to keep the case parallel to the board