CC @BananaPie
this is an iclass SR (legacy+sio)
its got standard keying so you wouldn’t need to do keyrolling as its not elite keyed, the issue here is that the SIO cannot be transferred successfully to another iclass card that has a different CSN, and you cannot change the CSN.
so you will not be able to make an SR clone, on a standard iclass legacy if you take the 6/7/8/9 and write them into the new iclass and change 0xA3 to 0x03 in the first byte of block 6, this will make your card not present as an iclass SR but just a standard legacy, IF the readers are configured to allow PACs over legacy, it should accept.
HID have been pushing sysadmins to manually disable legacy functionality when not actively in use so that may be disabled, worth a shot anyway.
are we sure that they’re iclass readers and not multiclass readers because if they’re multiclass readers you may also be able to attempt a PACs downgrade to a lower chipset HIDrox on a t5577.
to test this I would make two credentials, one T5577 HIDprox with the pacs encoding, and one legacy with the PACs encoding with that block 6 change.
sorry it took me a while to reply I’m at EMFCamp but I am following along interested to see if youre able to get this working.