It is. When you load the ios5 firmware in it will then give you 3 options. The top one is to preserve the baseband. It will not jailbreak it but will simply make the stock baseband able to update without touching the baseband.
Also theres the question of if you had baseband 6.15 before the update how did you get there if you didn't use sn0wbreeze. If you updated via itunes... which you SHOULDN'T have done... then it has messed up your 6.15 baseband and you will have to reflash the 6.15 baseband using redsn0w.
The windows redsn0w that is currently out is not capable of the custom firmware. However you can download sn0wbreeze which will give you the ability to make a custom firmware in windows.
If you happened to install stock firmware through itunes it will have tried to install the standard baseband for ios5 which in turn will mess up the 6.15 that you have installed. What I did in this case was instead of jumping through hoops with a custom firmware I just loaded the stock firmware into redsn0w and instructed it to jailbreak my phone and install the ipad baseband(or in my case as well as the case of many of you reinstall it). This worked perfectly for me and was up and running in a matter of minutes.
They tell you to use a custom firmware either produced by loading the stock firmware into either redsn0w or sn0wbreeze both of which modify the firmware to accommidate the 6.15 baseband that you already have installed on your device.
redsn0w 0.9.9b4 is already available and works in windows. There is a link for it at the bottom of this article.
Before updating to ios 5 did you have any issues entering DFU mode? Also do you have any physical issues with the buttons on your phone for example is your power button or home button broken? I'ver personally never seen an iphone not enter dfu mode unless there was an issue with either the power button or the home button. Unfortunately there is no way that I'm aware of to enter DFU mode. The good news is that either button is easily fixed either by yourself or I'm sure you have some store in your area that offers repairs on iphones.
as we are working with ios 5 it will have to be either 9.9.4 or 9.9.5. If you are running windows your only option currently is 9.9.4 and both of them should allow for flashing the ipad baseband.
as far as your information is concerned I don't know whether you backed up your data before trying to update but the good news is that you dont have a dead phone. What you need to do is open redsnow again and load your ios 5 firmware in like you are going to jailbreak again. When it gets to the section where you have the opions of installing cydia, a custom firmware, installing the ipad baseband, and deactivate this is where you make the difference. Based on your old post you have already jailbroken your phone using redsn0w but used stock firmware to get to where you could use redsn0w because of this your 6.15 baseband is screwed up. Once you get to that selection screen deselect the cydia install if you've already done it before and simply select the ipad baseband. This should flash your baseband again and allow you to go through set up.
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