New Nikon D40 & D40x Firmware Update - 1.12 & 1.01

Nikon has released a firmware update for its D40 and D40x DSLRs. Version 1.12 for the D40 and Version 1.01 for the D40x improve compatibility of both cameras with Nikon's new EN-EL9a batteries. With the updated firmware, the D40 should deliver approximately 510 shots in single-frame shooting mode using the EN-EL9a, according to CIPA standard tests, rather than 470 with the original EN-EL9 pack.

Nikon D40 firmware updates:
Click here to download firmware v1.12 (Windows)
Click here to download firmware v1.12 (Mac)

Nikon D40X firmware updates:
Click here to download firmware v1.01 (Windows)
Click here to download firmware v1.01 (Mac)

From Dpreview.com

New Nikon D40 Firmware Update 1.11

About this firmware updateThis download provides software for upgrading D40 A firmware to v1.11 and B firmware to v1.11. When performing this Firmware Upgrade, be sure to upgrade both A and B firmware. Be aware that operation of your D40 is not guaranteed if either A or B firmware is upgraded to v1.11 while the other firmware is not upgraded.
The following issue has been resolved in version 1.11. Shooting times were not always accurately recorded within the image data for images captured in bursts of continuous shooting.

Click here to get the update