i recently got a used z9 from a friend and i didnt try the camera all day when i did it says busy try agian later i took the battery out for a min put it back in nothing can anyone help me??
You can try to reflash the firmware. Maybe that will fix it.
Power off the phone and press #, * and power on at the same time. (A bootloader screen should appear) Post your firmware & bootloader version.
Also, reflashing the phone will erase all your, pictures, mp3 music, etc that you've added to the phone.
So make sure to backup all that stuff before hand, if you want to keep it.
Make sure to have a Fully Charged battery, before flashing the phone.