redmi3, xiaomi.eu 7.1, bought from amazon.
I reported the problem the mute button and waiting that are activated independently in the call.
They replied:
Dear customer, we recommend you perform a factory data reset. If that does not work can update your device with the updater just by downloading the latest release of xiaomi.eu.
I wonder:
if before restoring the factory data, do a backup with the appropriate function, then doing the restore also the "error"?
there is another way to quickly restore contacts and apps?
anyone can help me?