I did try doing this with K5A5, but it did not work, though was likely due to the JCID firmware for the K5A5 just being bad in some way. Just try with K5A4, in theory it should work. Just flash each one by selecting āFormatā option in JCID with iPhone 15 selected, once it writes the firmware it should read as being in a āgeneral stateā. Once all 4 are programmed this way, they should work fine in any valid configuration, and get programmed appropriately during DFU restore.