"Can't get tfp0"

[TDPFlorida]

I get "Can't get tfp0" on the top button no matter what I put in the box. What am I doing wrong?

Thanks

iPhone 7 plus iOS 12.4

It does this whether the iPhone is JB on not and I have tried the default

[viktorkuts]

Had the same issue a year ago. I opened a similar issue back then, might help.