I also have a similar request.
The various manuals refer to the fact that it is possible to modify the config file directly via USB with the config tool
I quote "11. The generated * .hex can be directly programmed into the BM83 module by following the
steps mentioned in the BM83 Bluetooth® Audio
Development Board User's Guide (Section 5.2
Firmware Update). It is possible to update only
this config file by just selecting this .hex file in
the update process and selecting image number
to 1 in the isUpdate tool. "
I tried to perform the procedure without success.
There is no complete guide in all manuals on how to use and modify the system.
I recommend implementing it because some steps are not clear.
I use bm64 modules successfully but the procedure is different