Step's to update baseband in iPhone 3G's to 6.15 safely

Hi, i will post this little guide because i read some bad rumor's in other forum regarding iPhone 3gs (mostly) with corrupted baseband,why? Because due of wrong updating. . .

Before recieve an iPhone you must check step by step first especially if the serial has a latest manufacturer date release this year,

Go for updating baseband 6.15?

• go to about
• check all information and version
• connect iDevice and back-up (optional)
• check the manufacturer date
• also check using iPhone serial # checker (green and red indicator)
• look at the storage space at the back or in about if (8gb, 16gb or 32gb)
• last check the bootroom (here)

Chart (guidelines):

 8gb > w/ latest man. date? new bootroom? red indicator? = 100% risky,
       > w/ old date? old bootroom? green indicator? = 100% safe

16gb = mostly SAFE
        > w/ latest man. date? new bootroom? red indicator? = 100% risky,
        > w/ old date? old bootroom? green indicator? = 100% safe

32gb = mostly SAFE
        > w/ latest man. date? new bootroom? red indicator? = 100% risky,
        > w/ old date? old bootroom? green indicator? = 100% safe

Based on my experience, i alway's incounter a problem almost in 3g's phone with 8gb allocated size, just follow the guide if you're interested. Thank's for viewing folk's.