1. I don't know about this, sorry I can't help here
2. W810i is different cuz it's CID 49, FAR can't read it just like that, you need to flash a brake-in loader or a so called fake main (w810_p3k_dcu.49R.ssw) and just after that you can acces the phone with FAR.
3. You saw wrong, you can unlock W810i at home but you need a cruiser or a service cable to do that. DaVinci is the safest way to unlock W810i with DCU-60 cable. For unlocking use DaVinci for unbranding use XS++ and FAR.
Here are two links on how to customize and debrand W810i for free with DCU-60:
http://www.topsony.com/forum/showthread.php?t=45 - this is how to customize
http://forum.gsmhosting.com/vbb/show...9&postcount=17 - here is the tutorial on how to unlock and to unbrand W810i (you need to replace the MEDITERR firmware (FS and CUSTOM files) with the ones you need according to your area)