Force restore on DNS devices

How to force a factory reset or hard reset on DNS devices

DNS S4505M DNS S4505M
DNS S4504 DNS S4504
DNS S4503Q DNS S4503Q
DNS S4502M DNS S4502M
DNS S4502 2SIM DNS S4502 2SIM
DNS S4501M DNS S4501M
DNS S4010 DNS S4010
DNS S4008 DNS S4008
DNS S4007 DNS S4007
DNS S4006 DNS S4006
DNS S4005 DNS S4005
DNS S4003 2SIM DNS S4003 2SIM
DNS S4001 DNS S4001
DNS S3502 DNS S3502
DNS S3501 DNS S3501
DNS AirTab MW1011 DNS AirTab MW1011

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