As your company is only a firm and not a limited company, there is no requirement for you to file an annual return as required by the Companies Ordinance. You just notify IRD with your IRC 3113 that your business is to be ceased. The tax depatment may send you a tax return for completion if they think fit. Still, if you had no business, then state it clearly in the tax return. A easy job. For details, you can go to the web-site:
http://www.ird.gov.hk/chi/tax/bre_cbr.htm
You can done this easily by yourself and not for a limited company incurring a big cost on this cessation and/ or deregistration or even winding up.