qtek 9100 wm5

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Hi all.I have a qtek 9100 with wm 6.1 taurho ipl 1.01 and spl 1.05.
the phone work well,but i have a two problems:battery drain and the system that is very very slow..so i want to change rom and install wm5.
i doesn't know nothing to change rom or upgrade,because i have buy the phone already with wm6..
i premise that the phone is german and probably for use the italian sim and operator,the phone had to change national code(maybe.. )

So:how i find the rom and the guide to change the phone from wm6 to wm5?i need also the guide who teach me how change device nationality,because i can't use my italian sim.

thank you all so much