Australian passport updating
Make sure there are no alterations to signatures or dates.
OR In person: during your scheduled appointment (Step 1) at the Hong Kong Passports Office. Some photo shops may not have the most updated Australian passport photo specifications.
Your photographs do not need to be endorsed by someone else. Applications must be lodged in person at the Australian Consulate-General in Hong Kong.
You can renew your passport online if you're 18 years of age or older; your most recent Australian passport was issued when you were 16 or older and was valid for at least 2 years when issued; and that passport is still current or expired less than 3 years ago.
If you are not eligible to renew your passport, please see I want to apply for an Australian passport.