I'd like to change the firmware of my SE K750i from
R1AA008 version to the last official (stable!) release (I think is the
R1BC002) through
SEUS (I hope to eliminate the noises during the calls).
Before starting, however, I'd like to know if it's possible (and how?) to
reinstall the preceding version of the firmware if something went badly
after the upgrade.
Do U recommend to proceed in the upgrade even if the new firmware seems not
to read the m4a files? (which files are these?!)
K-750i - changing the firmware 
Linear Mode
