Help restoring stock firmware!

I rooted my S6 Edge on version 5.1.1 and I want to unroot. All methods I've seen I have to download the stock firmware and use the root precess to install that instead but I doesn't work, I managed to soft brick my phone and the only way to get it back on is by reinstalling the root kernel. Does anyone know how I can full unroot?

Model Number: SM-G925F
And I use EE mobile service

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