Pros: It works
Cons: You will NOT be able to uninstall the 5.2008.43-7 upgrade on the modified booting OS. I have no idea what does that mean to the tablet, now or future. I did mine on a MMC boot, and the internal flash 5.2008.43-7 upgrade is NOT affected,i.e., what you did to OS on MMC boot, in general does not translate to the OS in flash system. In general...

Prequalification:
- 5.2008.43-7 upgraded
- advanced-backlight installed

Enable Extras-devel
- AppManager>Menu>Tools>Application catalogue...
- New
- Cat name: maemo Extras-devel
- Web address: http://repository.maemo.org/extras-devel/
- Distribution:
- Components: free non-free
- Disabled:
close AppManager.

X Terminal
~ $ gainroot
( substitute cmd1-3 with cut and past from below)

/home/user/ # cmd1)
size 1529986
/home/user/ # cmd2)
size 694854
/home/user/ # cmd3)

unpacking....

/home/user/ # reboot
Disable extras-devel
AppManager>Menu>Tools>Application catalogue..>Edit extras-devel and checked the Disabled square.

done

cmd1) = cmd2) = cmd3) = Credits: The above are all copied from wiki (http://wiki.maemo.org/Rotation)

My N810/N800 are both booting from /MMC1.

The 770 setup is MMC boot with 48 MHz clone, http://www.internettablettalk.com/fo...mmc+boot+speed.
The 770 does NOT work, it does flip, but it also messed up the touchscreen, the hardware button works though.....anyhow, I cannot make it work. It is still fun to see it flips.

Pics:
1) xterm output
2) N810 WorldTV99 CBC
3) N800 WorldTV99 CBC
4) N800 WorldTV99 CBC
5) 770 home page

Enjoy,

bun