I'm actually quite surprised with this firmware after reading all the Doom and Gloom. The installation went smoothly and the sound quality to my ears is better then 2.0. The Bass seems where it should be (I dont use any EQ) and everything seems to be layered better with a lovely wide soundstage. I like it!
The Fiio music app seems a bit of a mess, but i understand this is a Beta and it is being worked on. The initial Music scan was taking forever, I cancelled it and am just navigating by the folders for now.
One thing that i have found odd is the way the firmware handles secondary launchers, I like to use Nova Launcher, but found pressing the home button would always revert to the default ugly launcher. The previous firmwares were also a bit odd around this, where the default launcher would reset after rebooting, it was annoying but workable..I spent a couple of hours trying to get around this last night and finally success!
Here's a bit of a rough guide for anyone who may be interested :-
***DISCLAIMER - requires Root and if you ever need to factory reset or anything goes wrong you will have to flash firmware again using the same method used to install it originally on your computer***
Edit - while this did work fine, i've rebooted the device several times since i did this last night and it had worked fine; however while not in use on my desk as i typed up this guide the device had just shut down itself (Crash?), and upon rebooting has booted straight into the Fiio music app, as if in Pure Music mode..
1, Factory Reset the Device
2, Root using your preferred method - Kingroot is the easiest
3, Download your preferred launcher, run it once and attempt to set it as default launcher (from the launcher's settings) - I reccomend either Nova Launcher or Action Launcher 3
4, Launch ES File explorer - it will want to update - you can let it if you want
5, Go into the settings of ES explorer and activate 'Root Explorer'
5, Click 'Apps' from the main screen and then select 'System Apps' from the drop down
6, Locate 'Launcher3' in the list, select it and uninstall it - you'll instantly start getting Launcher 3 errors
7, Hold down the power button and select 'Reboot' - the X7 will reboot and your preferred launcher 'should' now be the default
Enjoy!