That is strange the DStv app worked before the Reset and now it doesn't. A reset just erases user data and internal SDcard. You can try to spoof your device through modifying values in the /system/build.prop and /vendor/build.prop like the fingerprint, make, model, and device (*Note: modifying build.prop can brick device and cause a bootloop if done incorrectly). But if DStv-Now is looking for DRM Widevine L1 and not just a certified device Name then you won't ever be able to Fake DRM L1 on any device to get DStv working.
My suggestion is just buy a second device that is fully licensed and certified, most TV's have multiple HDMI ports, so look at getting a Roku or FireTV-Stick device for using with paid apps.
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