I have been using LeEco Le Max 2 for more than 2 years and I have done all the possible things with my Le Max 2. In the search for best performance I have tried so many custom ROM but maximum custom ROM has camera focus problem or battery drains very fast or fingerprint does not work. Finally, I switch back to EUI and its EUI 6.0.30S. Its the best optimized EUI version for Le Max 2.
EUI 6.0.030S is the latest EUI and official launch for Le Max 2. But this Official EUI 6.0.030S ROM has irritating things like bloatware and ads. Imagine a ROM has bloatware how annoying is this. This Offical EUI 6.0.030S ROM has modified by a developer and cleaned this ROM and removed all those bloatware and pop up ad.
In XDA you will get another modified EUI 6.0.030S ROM comes with face unlock and some extra bloatware. But I will suggest you if you are using Le Max 2 then try this cleaned EUI 6.0.030S ROM. In this ROM everything works fine like camera, fingerprint scanner, VOLTE and others features. The performance is great and the battery backup is decent. The EUI 6.0.030S is based on Android 6.0.1 which disappoints you.
How to install Cleaned EUI 6.0.030S ROM
Make sure your phone has TWRP installed otherwise root and install it
Download the ROM and GApps zip file and place it inside your phone memory
Switch off your phone
Press and hold Power+Vol Up till its boot into TWRP Recovery
Tap on Wipe then advance wipe
Select delvik, System, cache, data
The just swipe for wipe data
Now back to the main menu of TWRP and tap on install then browse the ROM Zip file and swipe to flash
Once down reboot into system
It may take 10-15minutes to boot
Once booted up configure your phone.
Switch off your phone and again go to TWRP Recovery
Tap on install and select the GApps zip file and swipe to install
Once done wipe just delvik then reboot into system
Your new EUI 6.0.030S ROM is installed as well as Gapps
In case if you are facing any problem just comment here.