|Fig: 1 Windows Explorer screen shot showing saved|
location of firmware upgrade file.
At the time of writing I'm not aware of any general firmware upgrades for these cameras. Upgrades that are available are for specific issues such as the one detailed below; and as far as I know, the upgrade procedure is always the same for 5210s and (6210s see the post update 29/05 below).
Also read: Firmware Updates, Upgrades and Software - Little Acorn Trail Cameras