It is an iPad Air3 Cellular model.
After replacing the nand chip, the ipad works normally. However, since the existing nand chip is completely dead, there is no way to extract the serial, Wi-Fi, and Bluetooth Mac addresses. (I tried the nand programmer, but I couldn't query any Mac addresses. The chip is completely dead.) Sadly, I don't even have a Mac address written down before, so there is no way to know it.
+For devices A12 and above, I understand that Mac Address is also stored in AP, and I was wondering if there is a way to extract it.