[Q] European 10.1 Tab - 3G

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Need some advice.. Posted on a few other places but no luck with answers..

So just a few questions..

1. Galaxy Tab 10.1-WIFI/3G version bought in Sweden. Where can I download the stock firmware for my version? ( in case I want to make it stock again. )

2. Do I need to be careful when flashing a custom Rom that it is:
For the european Tab 10.1-WIFI/3G or can I also use the american Rom for example?

3. Do I need to make sure that i install a custom rom with WIFI/3G in the rom, even if I do not use the 3G part? if i do not care about the 3G part for now, and I install the WIFI only version, can I come back to the stock Rom and it will restore my wifi/3g working correctly ?

4. When flashing a custom rom, how do I know if it is for Europe or America and how can I tell if it is WIFI/3G ready? I see a lot of post that say WIFI only but none that say wifi/3g..

I am sorry in advance for the question, as there are many . any help would be very nice thanks