iPad ipsw firmware download that provided by Apple, when you do the relevant operation at your own risk.
A2696 / A2757 / A2777 / A3162
20D67 · iPad13,18 / iPad13,19
20D47 · iPad13,18 / iPad13,19
20C65 · iPad13,18 / iPad13,19
20B101 · iPad13,18 / iPad13,19
20B82 · iPad13,18 / iPad13,19