hi guys, as far as i know, changing the product code will void warranty. What if after i update the firmware and change back to my original product code again? Do my warranty still valid if i bring my phone to NSC?? And will this brick my phone or affect my phone in the next update in the future? Thanks..

Hi guys, i got this reboot problem on my phone. If i got my memory card inside my phone, after tuning off my phone, it wont open again, it will stuck at the NOKIA logo and off itself. But if i take out the memory card and do the same thing, it can boot up successfully. Afterthat, i will put bck the memory card and everything works fine. I try to change a new memory card but the same things still happen. Any idea why is this happening?