You've got more experience because you got more post? lol. Is that all you can think of?
You've got more post than me so you are better? That doesn't make sense.
Jailbreak voids warranty. It's a known fact. Try bring in your jailbroken idevices and see if they will do any warranty work for you.
There are 3 types of 3GS out there. The old bootrom, new bootrom and new bootrom that is made after week 30 in 2011. If you have 'more experience' then you should of known this because it has been discuss in MR and other forums. You can keep spamming forums and have many more post than me but that doesn't make you more experience or knowledge.
Here is a document for you.
https://docs.google.com/document/d/1yu-5i8hufa0Iqpj6mq7PfbpcNX2sydiazmvxvas-9Ic/mobilebasic?pli=1