iphone 5S- Nike FuelBand SE login Problem (website maintenance)

I purchase a Nike FuelBand SE for my iphone 5S, and cannot connect via Bluetooth, and iphone Fuelband App show Website maintenance.

Search all these via google and find out a lot of people have the same problem.

Step 1)

I have tried:

a) Delete the app, reset the phone, and download again.

b) Reset the fuelband.

But still the iphone 5S cannot login( website maintenance ) and cannot pair with bluetooth.

Step 2) Finally I use Ipad mini (Gen 1) and install the app again. There is no more website maintenance after I press login and find the Nike Fuelband SE and connect via Bluetooth.🙂

I disconnect and try to use it with my iphone 5S but no luck. I have tried Step 1 again wiht my iphone 5S but still showing login problem.

At least I know I do not have a faulty nike fuelband but the problem is on my iphone 5S and would like to know others:

i) is the problem only with iphone 5S?

ii) Anyway to do a clean install of the nike fuelband app ?