How to safely shut down or force shut down Digma devices

Digma Linx A452 3G Digma Linx A452 3G
Digma Citi Power 4G Digma Citi Power 4G
Digma Citi Motion 4G Digma Citi Motion 4G
Digma Vox G501 4G Digma Vox G501 4G
Digma Hit Q500 3G Digma Hit Q500 3G
Digma Vox S508 3G Digma Vox S508 3G
Digma Vox S509 3G Digma Vox S509 3G
Digma Plane 7539E 4G Digma Plane 7539E 4G
Digma Vox E502 4G Digma Vox E502 4G
Digma Vox S513 4G Digma Vox S513 4G
Digma Vox Fire 4G Digma Vox Fire 4G
Digma Plane 1559 4G Digma Plane 1559 4G
Digma Plane 9654M 3G Digma Plane 9654M 3G
Digma Plane 1713T 3G Digma Plane 1713T 3G
Digma Plane 7552M 3G Digma Plane 7552M 3G
Digma Plane 7556 3G Digma Plane 7556 3G
Digma Plane 7557 4G Digma Plane 7557 4G
Digma Plane 1553M 4G Digma Plane 1553M 4G
Digma Plane 1715T 4G Digma Plane 1715T 4G
Digma Plane 8558 4G Digma Plane 8558 4G