Nikon has posted a firmware update for the Nikon D800 digital SLR camera. Version B 1.01 resolves an issue that, in some rare cases, caused the camera to “lock up”, i.e. become completely unresponsive to all controls including the power switch (while reviewing the camera, we ran into this issue once - then and there, removing and reinserting the battery solved the problem). Additionally, the firmware update offers a fix for two minor bugs related to I) using the Nikon D800 with the optional WT-4 wireless transmitter and II) shooting in 5:4 crop mode with Active D-Lighting turned on. You can download the firmware upgrade from the website below,

Website: Nikon D800 Firmware Update B 1.01 | Nikon D800E Firmware Update B 1.01