deleted product in acer account

Hello! 

I am new to the acer community.

I would like to get some information about the acer account.

So my smartphone was listed there as one of my acer product, and unfortunately i deleted from the prdouct list.

Now i cant put it in the list because it was already registered before. 

So my acer prdouct list empty. I dont see new downloadable content or other useful content to my phone.

Please help me, if you can.

Thanks