For that problem of fetching ipadbasebad follow the following steps before browsing the firmware
1. Open the redsnow first time.
2. Run the taskmanager and find the process for redsnow.
3. Right click on that, go to the process affinity and you will see 4 processor running on that cpu0,...cpu3.
4. Check only cpu0 and uncheck any others.
5. Then continue redsnow browsing firmware, DFDu etc

If any problem fell free to contact.