guys.. i'm getting my tube 2day...

1.if it doesnt come with the v20 firmware.. can i update it at any nokia centre since its not available from nokia software updater..

2.did some searching online and it says i can change my product code and update online but it will void the warranty.. so is it possible to change the product code back to the original one after updating to v20 firmware (if i decide to to it myself online)..

3.would nokia care find out if i changed to code before in case i send to phone in for any warranty issues..

thanks in advance guys..