Temen temen FN yang punya Nikon D40, saya mau sharing nih
Link Update Firmware Nikon D 40
berikut linknya :

Firmware A/B Nikon D40 V. 1.11
http://support.nikontech.com/app/answers/detail/a_id/14543

Firmware A Nikon D40V. 1.12
http://nikoneurope-en.custhelp.com/app/answers/detail/a_id/27321

semoga bermanfaat
Salam FN