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Door station DMR21 purchased after 2018 can backup or restore card, settings, data via SD card.

Backup

 DMR21 ID card backup：

Set DIP6 to OFF, formatting SD card on PC，then insert SD card, power on door station, Long press A key. ( LED_CALL ON, LED_TALK OFF, LED_UNLOCK ON, BP+,BP)，it is on backup;

After  LED_CALL, LED_TALK and LED_UNLOCK are OFF, BP+, it is finish backup.

SD card file check after backup:

Restore

Upload to other Door stations: 

Set DIP6 to OFF, then insert SD card, power on door station, Long press  B key. ( LED_CALL OFF, LED_TALK ON, LED_UNLOCK ON, BP+,BP)，it is on restore；

After  LED_CALL, LED_TALK and LED_UNLOCK are OFF, BP+, it is finish restore.

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