no.nordicsemi.android.dfu.internal.exception.HexFileValidationException: Not a HEX file

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no.nordicsemi.android.dfu.internal.exception.HexFileValidationException: Not a HEX file
at no.nordicsemi.android.dfu.internal.HexInputStream.checkComma(HexInputStream.java:324)
at no.nordicsemi.android.dfu.internal.HexInputStream.calculateBinSize(HexInputStream.java:97)
at no.nordicsemi.android.dfu.internal.HexInputStream.(HexInputStream.java:83)
at no.nordicsemi.android.dfu.internal.ArchiveInputStream.parseZip(ArchiveInputStream.java:273)
at no.nordicsemi.android.dfu.internal.ArchiveInputStream.(ArchiveInputStream.java:113)
at no.nordicsemi.android.dfu.DfuBaseService.openInputStream(DfuBaseService.java:2091)
at no.nordicsemi.android.dfu.DfuBaseService.onHandleIntent(DfuBaseService.java:1196)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:66)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)

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