Does it have ant+ hardware ?
I want to use my garmin HRM ant+
Any application that tries to use ant+(ANT radio service) forces Mi6 to reboot.
On Xiaomi A1 I have connected HRM via ant+ successfully.
Is it hardware problem or software?
ANT+ worked on the Mi A1 until the Android Pie upgrade was installed. This broke the firmware.
I have written/reported to Xiaomi on more than one occasion but have not received an acknowledgement or a response.