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observer DFU problem

Hello, I'm using this code(observer): github.com/.../nRF51-multi-role-conn-observer-advertiser SDK9.0.0

I try to add DFU function, now can enter dfu mode and iPhone6 can see advertising and connect it. But the connection is very slow and nRF Toolbox will stop at 1%.

If I skip btle_err_code = btle_scan_param_set(scan_param); The update will be fine. I tried init again or call btle_scan_param_set with different parameter, nothing work.

Do anyone know how to fix it?

Sincerely, Kirby

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