Hi , I think the key question for ECO mode is what is indeed the impact if any on the sound quality. From what I can see the new version of the Eco mode prevents the use of certain functions such as bluetooth or gain choice. If the ECO mode is only impacting on this type of secondary functions without impacting on the SQ but providing more battery, then I think it is interesting. Perhaps @Team HiFiMAN could ellaborate on what is indeed the impact of ECO mode on the actual sound quality by contrast to HIFI mode? Is it impacting other part of the sound processing such as the upsampling? Concerning your second question, I did not use much the file ordering before because I was mostly using the folders browsing. That said I tried before the file sorting briefly and it seems to me it is now faster, i.e. after rescan when you choose to resort the files it seems it is faster to do it. This is just the impression I have but I did not keep track of how long it took before the update so you may have to double check on your device as I guess it may depends on the amount of data on your sd card. Last point, I agree that the loosing of the favorite list upon rescan is an issue which I also flagged before and unfortunately it is still there. To me given the relatively small screen and how challenging it can be to navigate in long list of folders or files the key improvements should be done on the management of favorites as follows: - ability to remove one song from the list of favorite without clearing the entire list of favorite. ; - ability to keep the list of favorite notwithstanding the rescan i.e. of course if some songs were removed in the meantime, the list of favorite should be updated not to include them but other songs which have not moved on the sd card should still be in the favorite list. I hope Hifiman can take in account these simple requests. I have been using Hifiman daps for many years (indeed since they released the first gen 901) and their UI while not being the most impressive had better functionalities.