Adjust the Db input for Bandit

CBR rider
CBR rider Registered Users Posts: 1
New Traveler
edited January 25 in TomTom Sports
Hi, sorry if this has been covered but I haven't found an answer to my query.
The external mic has issues as has been discussed.
Reading through the forums I noticed some of the ppl posting got to use an "experimental" firmware update that allows the user to adjust the Db input.
If this is true, how do I access this update? And how do I use it.