thank you for the link.
I already tried this method , it does not work .
see
http://imagik.fr/view-rl/136333 ( method "erase tags" )
http://imagik.fr/view-rl/136338
( method " format tags)
Here are the nfc ring properties
http://imagik.fr/view-rl/136343 and
http://imagik.fr/view-rl/136341 .
thank you for your help.
Lokki , i do not understand.
I can do nothing?

thank you for your answer
I already tried nfc TAGwriter by NXP, a message says "write protect failed (unknown error)"http://imagik.fr/view-rl/136194

Hello, I do not know why using this application, https://play.google.com/store/apps/details?id=com.nfcmobilekey.free, NFC RING is locked in writing, I'm not able to reprogram.
I try several application to initialize or erase the data on the ring as nfc TRIGGER or NFC TOOLS, but impossible to write on the nfc.
Is there the possibility of a reset to bypass this security.
Thank you for your help.