I do not have paper box, I have to reset router, with login data: admin/empty I am unable to login. How can I reset my router, I do not have may paper box with me anymore. My router is Hap Ax3

On my CRS310-8G+2S+IN, the default admin password is on the sticker directly on the device - is that not the case for the hAP ax³?

No there is a little pull out tab on the ax3 if I recall correctly.