Whenever I tried to write it said "Read only cannot write", that's including booth sides (tags).

@Lokki Thank you very much for your concern and prompt respond. The tag on the soft side (black) of the ring has been formatted (quick format method), but not accepting full formatting; furthermore, the other side of the ring (carbon fiber) has never accepting formatting due to partial protection. I have tried to remove the protection, however, it wont be removed on this tag (carbon fiber) side, but not on the other side (black). This problem eliminating writing on both sides of the ring. I would like to add that this problem occurred once I used the app to lock the phone, but even after unlocking, the issue still existing.

Thank you @Lokki for your assistance.

Why my ring cannot accepting to write data?. A message said (tag for reading only) every time I tried to write my data on the ring.

I've tried to format the tag but I got "Format Failed, IO Failure" message.

How to correct this failure?

@Lokki Yes this happened with both sides. How to format the tag?

Thank you very much for your assistance.
I identified my sweet spot and the ring finally connected with my mate 8, however, it cannot accept transferring my data, it said "Unable to write to your NFC, tag is read only".

How to solve this issue?

Thank you.
My device HUAWEI Mate 8 couldn't recognize my ring. I've tried every thing without hope.

Please help SOS.

I've tried hard to register my ring without hope at all. Struggling to find my sweet spot is the only message I always getting.
HUAWEI mate 8 is my device.

Any clue?