Both the genuine Reality XP GTN 750/650 Touch and the genuine Reality XP GNS 530/430 V2 for FltSim are always compatible with any future 4.x P3D4 version* and we've just released new updates compatible with the P4D v4.5 autopilot (v2.5.16 and v2.4.11 respectively).
*unless Lockheed Martin is breaking gauge compatibility with the SDK in a 4.x update. Note: although the autopilot needs a specific GTN and GNS V2 update for each new Prepar3D 4.x update, the Reality XP gauges are designed to be P4D4 future-proof for all their other features.
RXP GTN and RXP GNS V2 are forward compatible with any P3D v4.x
because in order to take control of the autopilot for any 3rd party aircraft, the GTN and GNS V2 need to take control of the autopilot system at the 'root' and this is feasible only in hacking the process because the SDK is too limiting.
There are quite a number of other hacks to build a product like the Reality XP GTN and GNS V2 and they are all self-adapting to future P3D4 updates in using a form of 'AI' internally. It was an R&D investment but this saves us a lot of support work in the long run and ensures our customers always have their products running on a new P3D4 update right away.
However, there is one such low-level hack which can't be automated as reliably as the others for now and this is the autopilot hack. It is quite fast (so far) to handle this one manually and release an update. Hopefully this time, P3D4.5 was released about the same day we were wrapping up the Reality XP GTN and GNS V2 updates and there was no delay for having both the RXP update and the RXP new features and enhancements at the same time!
Why is the autopilot not working with any new P3D v4.x update?
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