Here i guide How to update ur IPHONE 4 whithout updating Baseband

Here i help some new guy,s for updating IPHONE 4 & remain old baseband for unlock.
1- Download Tinyumberala from site
2- Download new firmware 4.2.1 or 4.3 for flash as u want
3- Conect phone to computer & start ITUNE software
4- Run Tiny umberala & save ur SHSH files
5- Start TSS server........it will close ur ITUNE..........it mean now server is running
6- Open ITUNE software again & start software RESTORE whith holding SHIFT and select file
7- in the end it should give u error 1013 ............. dont worry ........this is normal
8- now ur phone will be in Recovery Mode
9- Put ur phone in DFU mode
10- Start Greenpoison software & Jailbreak it


   Now ur phone will be Jailbreak & remain Baseband old 1.59 whitch is unlock able