Tried to atualize iPhone SE and get Error 53. Follow the procedure to restore and didn

What type of computer, which version OS, which version of iTunes? And have you had a 3rd party screen replacement?

iPhone SE iOS 12.4.1

I'ma try using a more recent MacBook Air and see how that goes.

Computer: iMac (20-inch, Mid 2007)

OSX El Capitan 10.11.6

iTunes 12.8.2

All original: no replacements.

Depending on the version of iOS on the iPhone you need at least iOS 12.9.x to activate it.

Glad you got it sorted out.