Re: Firmware 4.5.2 QC35 ii
I agree that Bose should let anyone who wants to downgrade to the previous firmware version (4.1.3) to do so.
Don't bother with the downgrade procedure.
Yesterday I have downgraded to every previous firmware, to no avail. Same lack of ANC, no difference between LOW and HIGH settings, every exterior sound (mids and highs only) is amplified.
It seems that the only reasonable sort-of-explaination/guess is the one offerd by an user on page 105:
Thanks, i would think it is a volatile calibration data of microphone gains, excuse my technogibberish. Once corrupted it will newer come back even if you reinstall firmware.