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nRF52820 secure bootloader uart

Hello,

we are trying to get the uart secure bootloader running on the nRF52820.
When linking we receive the error message that RTC1_IRQHandler is defined multiple times, once in bootloader_dfu_timer.o and once in app_timer.o.

We are using the SDK17.1.0

As far as I've seen the problem is that the nRF52820 only has 2 RTCs. RTC0 is used by the softdevice and now app_timer and bootloader_dfu_timer both try to use RTC1.

Has anyone successfully gotten the bootloader to run or at least to compile for the nRF52820?

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