dating to sister - Updating a firmware to format the nokia
If you can, try to back up your files manually by moving them onto a memory card using the N800's file manager, as they will be safe on the card. Firmware updates also wipe any extra applications you've installed since you got your tablet.
Unfortunately there is no way to back these up, they have to just be reinstalled after the firmware update.
The process of upgrading the OS is technically identical to the process of updating the firmware.
Before you do a firmware update, you may want to back up its settings and data.
OS 2008 makes the N800 look and run exactly like the more recent N810 model, and run at the same speed too.