Sorry you are not making it very clear what you want or are asking. also provide info about your phone that will help. Such as Ipad baseband only works on 3G and 3GS. it's also a GPS killer. no need to say more since I don't even know if I'm helping.
ok found your other thread are you trying to get push doctor working on 4.1 or something like that. is that what this is about?
Use Pwnagetool (Mac) or Sn0wbreeze (Win) to create a custom firmware. Use either program or Redsn0w to put your phone in pwned DFU mode and then restore to the firmware with iTunes.
However, since 4.3.4 is now out, Apple has stopped signing 4.3.3 and there is currently no (to the best of my knowledge) Sn0wbreeze/pwnagetool available for 4.3.4 yet. So, unless you have SHSH saved for 4.3.3, you won't be able to do this until SB/Pwnage are updated.