Warning -- be aware of new iphone 3gs update not unlock it whit ipad baseband

Apple has released a brand new iPhone 3GS that have a new bootroom this 28 weeks of 2011.
Version is 4.3.5 with baseband 5.14.
A lot of jailbreakers and unlockers have encountered that when you update this baseband to 6.15 to unlock it,

You got corrupted baseband and it cannot used anymore.
Symptoms are:
No wifi
No ECID
No Imei
No bluetooth

as of now all informations i've got is all serial up to XXX109XXX is risky to update baseband.

XX109XX = 1 is the year of 2011 and 09 is week 9 of 1 year.
so if serial is XX931XXX means 2009 with week 31.
and its safe to update baseband.

Much better check the serial first before you update to baseband 6.15

THANX FOR EVERY ONE WORKS ON THIS INFO..And be carful.