Hi, Nordic
I check SDK13.0 bootloader_secure sample, it do not work
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nrfjprog download bootloader_secure
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use nRF Connect app in Android mobile phone to DFU (ble_dfu_send_hex\test_images_update_nrf52832*.zip)
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it can not start to dfu, android mobile phone only disconnect and show
:INFO:PB: Init packet data len: 61
:INFO:Handling signed command
:ERROR:SD req not met
:ERROR:Prevalidate FAILED!
:INFO:Sending Response: [0x4, 0xa]
Plz help me check why.