How do I update my 3GS and keep my baseband

[Mrozzy123]

i have a iphone 3gs with 4.1 i want to jailbreak to latest firmware ios 5.0.1 but i want to keep my baseband what should i do? The boot rom is 44, i dont know if it is old or if it is new,,,
All the help much apreciated,,,

Thank you very much

 

[iDonev]

Use sn0wbreeze to create a custom IPSW. If you're new to this search Google for a tutorial.