Used dd to write userdata.img into phone, now asking me for password

I used dd from twrp terminal to write to userdata on my phone using dd if=userdata.img of=/dev/block/platform/mtk-msdc.0/by-name/userdata when I did reboot, it asks for my password. I tried all the previous passwords I used before, but to no veil. Why is it asking for my password? How to overcome this situtation? Reseting does not seem to be working.