Here is a all of iPad Firmware that you can download directly from Apples’ Server. Apple’s has released iPad firmware of almost all version of iPad. The IPSW files can be used to downgrading iOS software of your iPad or you can be used for jailbreaking process for creating custom iPSW firmware. Here the links :

1. iOS 5.0.1  iPad 2 CDMA: iPad2,3_5.0.1_9A405_Restore.ipsw
2. iOS 5.0.1  iPad 2 GSM: iPad2,2_5.0.1_9A405_Restore.ipsw
3. iOS 5.0.1  iPad 2 Wi-Fi: iPad2,1_5.0.1_9A405_Restore.ipsw
4. iOS 5.0.1  iPad 1: iPad1,1_5.0.1_9A405_Restore.ipsw
5. iOS 5.0  iPad 2 CDMA: iPad2,3_5.0_9A334_Restore.ipsw
6. iOS 5.0  iPad 2 GSM: iPad2,2_5.0_9A334_Restore.ipsw
7. iOS 5.0  iPad 2 Wi-Fi: iPad2,1_5.0_9A334_Restore.ipsw
8. iOS 5.0  iPad 1: iPad1,1_5.0_9A334_Restore.ipsw
9. iOS 4.3.5  iPad 2 CDMA: iPad2,3_4.3.5_8L1_Restore.ipsw
10. iOS 4.3.5  iPad 2 GSM: iPad2,2_4.3.5_8L1_Restore.ipsw
11. iOS 4.3.5  iPad 2 Wi-Fi: iPad2,1_4.3.5_8L1_Restore.ipsw
12. iOS 4.3.5  iPad 1: iPad1,1_4.3.5_8L1_Restore.ipsw
13. iOS 4.3.4  iPad 2 CDMA: iPad2,3_4.3.4_8K2_Restore.ipsw
14. iOS 4.3.4  iPad 2 GSM: iPad2,2_4.3.4_8K2_Restore.ipsw
15. iOS 4.3.4  iPad 2 Wi-Fi: iPad2,1_4.3.4_8K2_Restore.ipsw
16. iOS 4.3.4  iPad 1: iPad1,1_4.3.4_8K2_Restore.ipsw
17. iOS 4.3.3  iPad 2 CDMA: iPad2,3_4.3.3_8J2_Restore.ipsw
18. iOS 4.3.3  iPad 2 GSM: iPad2,2_4.3.3_8J2_Restore.ipsw
19. iOS 4.3.3  iPad 2 Wi-Fi: iPad2,1_4.3.3_8J2_Restore.ipsw
20. iOS 4.3.3  iPad 1: iPad1,1_4.3.3_8J3_Restore.ipsw
21. iOS 4.3.2  iPad 2 CDMA: iPad2,3_4.3.2_8H8_Restore.ipsw
22. iOS 4.3.2  iPad 2 GSM: iPad2,2_4.3.2_8H7_Restore.ipsw
23. iOS 4.3.2  iPad 2 Wi-Fi: iPad2,1_4.3.2_8H7_Restore.ipsw
24. iOS 4.3.2  iPad 1: iPad1,1_4.3.2_8H7_Restore.ipsw
25. iOS 4.3.1  iPad 2 CDMA: iPad2,3_4.3.1_8G4_Restore.ipsw
26. iOS 4.3.1  iPad 2 GSM: iPad2,2_4.3.1_8G4_Restore.ipsw
27. iOS 4.3.1  iPad 2 Wi-Fi: iPad2,1_4.3.1_8G4_Restore.ipsw
28. iOS 4.3.1  iPad 1: iPad1,1_4.3.1_8G4_Restore.ipsw
29. iOS 4.3.0  iPad 2 CDMA: iPad2,3_4.3_8F191_Restore.ipsw
30. iOS 4.3.0  iPad 2 GSM: iPad2,2_4.3_8F191_Restore.ipsw
31. iOS 4.3.0  iPad 2 Wi-Fi: iPad2,1_4.3_8F191_Restore.ipsw
32. iOS 4.3.0  iPad 1: iPad1,1_4.3_8F190_Restore.ipsw
33. iOS 4.2.1  iPad 1: iPad1,1_4.2.1_8C148_Restore.ipsw
34. iOS 3.2.2  iPad 1:  iPad1,1_3.2.2_7B500_Restore.ipsw
35. iOS  3.2.1  iPad 1: iPad1,1_3.2.1_7B405_Restore.ipsw
36. iOS 3.2.0  iPad 1:  iPad1,1_3.2_7B367_Restore.ipsw

Download the firmware according to your iPad version.