Forgotten passcode

I recently forgot my passcode, and I factory reset my phone. But when I want to restore the old data from my phone, it tells me to fill in the old passcode from the phone, which is absolutely ridiculous since the reason I reset my phone is because I forgot the old passcode in the first place. It doesn´t matter which option I choose it always says to fill in the old passcode. I´ve tried to log in to my apple ID on the Ipad afterwards but even there it says I need to fill in the old passcode. This has made me very upset, this phone costed me around 900 euros and this is the quality that I get? Despicable to say the least. I can´t do anything with my phone now, this is so disappointing from apple.