tsschecker throws an error. Can it be somehow corrected?

Question

iOS

[TSSR] LOG: device iPad2,5 doesn't need a Baseband ticket, continuing without requesting a Baseband ticket
[TSSR] Request URL set to https://gs.apple.com/TSS/controller?action=2
[TSSR] Sending TSS request attempt 1... failure
[Error] ERROR: TSS request failed (status=94, message=This device isn't eligible for the requested build.)
iOS 6.1.3 10B329 IS NOT signed!

iOS 6.1.3 for device iPad2,5 IS NOT being signed!

Why is this happening? Due to the fact that apple stopped signing this firmware? And is there any way to fix it?