Reset OZM to default

I want to reset OZM to default. what do I do?
because Bluetooth is the only way I can access OZM. And I have closed it.

I am currently unable to connect all 3 of my OZM. The system shows an fail connection. I’ve been trying for 3 days. Can you help me?

Hi. Im currently building a SD image for repair/update. I send the link tomorrow. You need a SD and SD

However. can you give me some more details? Is your device visible in your smartphone bluetooth? It true, can you connect to bluetooth? If true, can you enable network share option in ozm device? If true have you disable wifi and mobile data before accesing (some mobiles do not connect to ozm while there is other connections avaliable)?