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The original IPSW the iPad came with you mean?! In that case it’s not possible to install that anymore since Apple will not sign it anymore.
 
What a bummer. I wanted to downgrade to 13 ideally or at least 14. Thanks for replying.
 
For documentation's sake, don't think the 15.0 value is correct. Pretty sure that 15.2 as Apple stopped signing anything earlier than 15.2 (read: 15.1.1) a week ago.
 
I wish Apple would let me install the OS version that the device was shipped with out of factory if I so choose to. After many years of using Apple devices I have the feeling that the best OS to use it's the one which was shipped with. With patches, but not a newer version.
 
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