You need to get your hands on a reflash cable. The $500 one comes with the $300 tune license, which you already have. So ideally you want to find a used Cipher cable (used to go for $200 new but unfortunately uprev quit selling them) or buy a tuner add on cable (tuner version cable with no license) for $400, which would give you the full tuner kit.
then you would be able to reflash the ECU back to stock when you wanted to, as well as reflash updates in the meantime. HOWEVER your tune is saved on the tuner's computer so you would need to get ahold of them to get a copy of it.
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