I have used the Onn included codes and the ones from my model # 100005397. No go. Do I need to switch to IR instead of UHF? I tried learning it too...no go
I downloaded the warranty from https://www.onntvsupport.com/wp-content/uploads/2019/11/onn-42in-and-above-warranty.pdf and found out it was an ELEMENT so I found one that worked!
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It has to communicate with the tv by IR, uhf is between the dish remote and the receiver. Try tv codes under tv brands like LG, Dynex, Admiral, or Vizio. Come back with working code and the brand it was found under.
Glad it worked out, Element uses those tv brands code set I mention as well.