iPhone 3G battery replacement

[aditghai]

My iPhone 3G doesn't hold a charge as well as it used to. I am thinking of getting the battery replaced before the warranty runs out(July 10th).

Apple advises that customers back up their data before getting the battery serviced.

Will they flash my firmware to the latest version, because I have Yellowsnow installed.

 

[jmann]

I would NOT take it in there jailbroken. You should restore it first otherwise they will void your warranty. You can always unlock it again/downgrade the baseband.