I think the app store only looks at certain criteria for granting permissions to download. It's not like an iPhone where apple knows every configuration of their phones. Android is more fragmented.

Please check in settings, how big the total internal flash storage and the available (free) internal storage are.

Also check the size of the FF app in settings -> apps. It should be between 500 and 600 MB due to the additional data downloaded in the background.

hölp hölp

The Chinese phone manufacturers offer much hardware on paper for a low price but they won't necessarily update and bugfix android at the same level as the more established companies. Probably a firmware/software thing...

Will check it...

Yeah it'd be cool if there was some sort of analysis of the system done beforehand.

You can run 90% of all apps. It's just the hardware taxing ones.

Idk if anyone said this yet but it is most certainly a ram issue. Android will close apps that are using too much ram since the OS itself needs it more than the apps do.

512 mb of ram was fine back when android first started but in 2016, its basically one of those, good luck with that m8 sorta deal.

According to FF's own twitter page, you need at least 1GB for it to run smoothly. I'd say 768 is the bare minimum but 512 is a no go. Android itself is a heavy OS hence why I'd never recommend a phone under 2gb of ram in 2016 even if people have to pay a bit more. The ideal entry level android phone would be a Snapdragon + 2gb of ram at a minimum but thats also above $100

Hello! How much RAM does your device have? The game needs at least 1GB RAM for it to run smoothly.

— FINAL FANTASY BRAVE EXVIUS (@FFBE_EN) July 2, 2016

The phones I always recommend for entry level buyers in 2016 are:

4Gb of ram, 64 Gb of Internal Storage, Snapdragon 430 for $179 no contract/unlocked

https://www.amazon.com/BLU-LIFE-ONE-X2-Smartphone/dp/B01M13TSHR/ref=sr_1_1?ie=UTF8&qid=1482789268&sr=8-1&keywords=Blue+Life+One+x2

or

2gb of ram, 16gb of internal storage, Snapdragon 430 for $149 no contract/unlocked

https://www.amazon.com/BLU-LIFE-ONE-X2-Smartphone/dp/B01LZHFSBC/ref=sr_1_2?ie=UTF8&qid=1482789268&sr=8-2&keywords=Blue+Life+One+x2

But they aren't exactly waterproof and etc tho

Sounds not good for me...where do i see how much ram has my phone, because under the section of phone information it says cpu mt 6582 quard-core but nothing about how much ram, but seems what i have seen on internet it should be 512mb ram

Just download an app called "CPU X" and then go to the "System" tab and scroll down to memory.

Says 

1 total ram 933,52 mb

2 free ram 120 mb (change everytime)

Yea the amount of free ram wll change since it depends on what apps are using how much at any given time. But that means that it actually has 1GB of ram and not the 512 which come up most frequently. So that means the only other thing is to free up the ram. Did you factory reset your device yet?

If factory resetting your device doesn't help, then its an issue with the OS since the OS is taking up too much ram. Most likely (I am not 100% sure), your device runs a modified version of Android OS which probably takes up more ram and stock Android does.