# DFU Bluetooth Low Energy Service

On the RSL device the DFU service is used as the server; the DFU service client runs on the PC (BLE Explorer). The "DFU Service UUID" table shows the UUID of the DFU service.

Table: DFU Service UUID

Requirement | UUID
Mandatory for DFU component, optional for device application | b2152466-d600-11e8-9f8b-f2801f1b9fd1

If the device application does not implement this service, another method must be used to activate the DFU mode in the device (e.g. connect FOTA_GPIO to ground).