i've got some basic questions.
1. should i have lan connected from modem to pc when i am modding ?

2. should i use 3.3 or 5v when i am modding?

3. LITE or DIAG? i am living in denmark,europe

1. yes
2. 3.3 (but if i need to power a chip direct i use a cut usb wire which is 5v and never killed anything yet)
3. if you have problems you will have to use diag

what about power cable ? sry cuz i am asking so much

what about it? (i see 3 questions which i answered )

the standart power cable to the modem

Yes, you will need to power the cable modem via its own power cable...

thanks for the help