Response to HP5, exposed at 3200 ISO, how do I save it?

Try Ilford Microphen 11'30"/75F or DD-X 1:4 14'30"/75F.

You need a speed developer such as one of those, T-Max or Acufine; I don't think any version of Rodinal is going to make it. If you can, shoot and develop a test roll before developing the important film.

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