Shut down or force shutdown on an Simvalley device

How to safely shut down or force shut down Simvalley devices

Simvalley SP-140 DC Simvalley SP-140 DC
Simvalley SP-121 Simvalley SP-121
Simvalley SP-120 Simvalley SP-120
Simvalley SP-120 DC Simvalley SP-120 DC

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