Changing the Admin QR Code is an important step in strengthening your BATM's security.
Your BATM will only recognize ONE Admin Key.
The BATM will only recognize the most recent admin key downloaded from CAS.
First try using the factory default QR code.
The key can only be changed while successfully connected to CAS.
Worst case scenario: reset the admin key code to the factory default:
Paste the password/key/string from the step 1.
Repeat for each & every Terminal in CAS (or use the BATCH ACTIONS).
The BATM will now download the key, and it should be effective within minutes.
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