I have five Humax boxes (9300T (retired), Foxsat-HDR, HDR-Fox T2, HDR-1100S and FVP-4000T).
I also have five different One for All remotes.
The initial setup key code differs depending on the Remote/Humax combination.
Irrespective of which One for All remote I use, the following are the initial setup key codes which work for all of my Humax boxes:
Humax 9300T - SAT 1808 or VCR 1794
Foxsat HDR - SAT 1176
HDR-Fox T2 - SAT 2443
HDR-1100S - SAT 2443
FVP-4000T - SAT 2443
Note: The above setup key codes only work if the Humax is set to Mode 1. If you are using Modes 2 to 6, you will need to use the "Learning" feature from your old remote (or contact One for All and see if they have an updated code for your remote).
See the following page to change Mode: https://myhumax.org/forum/topic/multi-code-function-hdhdr-remote-2
Once the basic functions are working, the 5 digit key codes are the same for all Humax models.
Note: some older remotes use a three digit key code instead of a five digit key code - they are actually the same codes without the "00" at the start of the number. "00296" becomes "296".