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Recently there's been firmware update 18120R (https://esupport.sony.com/US/p/swu-download.pl?mdl=HAPZ1ES&upd_id=11059&os_group_id=29) which brings the following improvements over version 18033R:- Improves playback quality for the USB digital output function.- Improves Network connections with HDD Audio Remote and HAP Music Transfer applications.- Improves communication security. HOWEVER - I'm facing an issue with the new firmware version 18120R. It seems that they added support for USB 1.0 as my Wadia 151 finally plays via USB even without conversion from USB>SPDIF, but it plays extremely silent !!! Has anyone experienced it? To get normal/standard volume level i need to max wadia out. Unbelievable, they managed to fix USB downwards compatibility but completely broke the volume level. It stays the same low level even after conversion from USB>SPDIF so it's definitely the output level of Sony's USB output. Can anyone advise how to downgrade the firmware (e.g. to the previous version 18033R)? Thanks for any suggestions