Orange SPV M1000 unlock and Flash

[dtechnology]

Hello,
I got an old Orange SPV M1000 (http://pdadb.net/index.php?m=specs&id=261). But it's locked on Orange NL SIM cards, while I have an Telfort NL SIM.
It's currently running the default WM 2003 OS.
I have two question:

Is there a way to unlock it? (i.e. by flashing)
I've seen that WM5 en WM6 can run on it. On this forums. Is there a speed difference between 4.2, 5 and 6? (128MB ram + 2GB SD)


If I download one of the roms on this forum, is there just something like a setup or is there a special way to flash it?

Thanks!

[Rudegar]

http://wiki.xda-developers.com/index.php?pagename=Himalaya
sim locks and roms are not really related read here how you sim unlock it
and should you wish to flash it with a new rom

putting on a new rom dont unlock it
and putting on a rom in general dont lock it