https://fenixsim.com/blog/entries/2025-09-02_bfu_patch2/

Edited September 2, 2025Sep 2 by grandfred29

Just now, grandfred29 said:

https://fenixsim.com/blog/entries/2025-09-02_bfu_patch2/

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BFU Patch 2

Posted September 2, 2025

 

Good afternoon all,

 

Today's update brings iterative improvements to areas we’ve already touched on in BFU, like some fly by wire roll work, but also includes some larger broader work shipping out to you, like our autothrust overhaul. Stick around to read the autothrust segment at minimum before you send in bug requests, it has some behaviour that may seem slightly odd to most who are not used to the real aircraft!

 

So, the autothrust - simply put, prior to this update, our autothrust was tuned to work nicely in the sense that it worked. But it did miss a bit of Airbus character - it was almost too good - it would keep the speed and alt pinned to where it needed to be, and it would quite rapidly hammer in thrust changes to achieve this. It would catch a falling speed trend with precision, but far too much aggression - leaving it quite late before slamming in thrust to catch the speed just as it needed to. It was almost like a computer game (yeah, I know..), but there was no real finesse to it. The real aircraft broadens the tolerances and acts nearly predictively (nearly - because it’s a touch simpler than a fully predictive system) to anticipate and smoothen out thrust changes and filter through what’s needed currently in the immediate, and what’s needed as part of the broader picture over a slightly longer period of time.

 

Now, we’ve rebuilt the autothrust to capture the above, just as is on the real aircraft, you’ll notice it’s just slightly more intelligent and broadly calmer - however, if you’re sitting a few knots off the target speed, don’t be alarmed, it’s just doing as it would in reality - working within the internally defined tolerances to smooth out thrust changes. Soft cruise is a function that received a rework alongside this new autothrust, so when you’re at ALT CRZ - expect to see it deviate more in both speed and altitude, once again a function to maximise passenger comfort as the aircraft trades off energy across speed and altitude to avoid changing thrust. This was present before, but it was far too rigid and working with autothrust that fundamentally did not allow for it.

 

Next up, we did a fair bit of continued work to the roll channel on the fly by wire, as ever searching for continued refinement of the manual flight and handling. You’ll notice the roll axis now having a greater sense of inertia - I validated this across three different level D simulators, and funnily enough, all three rolled differently. From the type-rated companions we had across the days, our feedback was along the lines of assuming the level-D provides a gist of feel, but is not considered inherently “the real thing” - So overlapping the gist of “feel” from the level-D, pilot feedback, and the datasets we used to adjust our control responses, has produced what will ship to you today. In order to achieve this, we adapted our roll PID controllers for better granular control, and specifically added a new damping channel for certain conditions, just giving us better control in the “snap” phases we wanted to better address.

 

Dave has also been busy on the sounds, clearing up a few more teething issues with the new sound system, especially on the CFM56, along with new and improved wind recordings for the flightdeck and cabin.

 

On the infrastructure side we’ve made some significant improvements to the core display rendering system, resulting in a simplification to the display options and their functionality in the Fenix Launcher, whilst making the displays more robust and performant. If for some reason, something that was removed or restructured has inversely harmed your specific experience - you may roll back, but first please reach out to support so that we can resolve the issue for versions going forward and you need not remain stuck in the past!

 

And finally, on the commerce side of things - customers in China no longer need to resort to third party payment schemes as we now support Alipay and WeChat Pay amongst a host of other new options like iDEAL for those in the Netherlands.

 

That should cover most of the highlights, but as usual, the full changelog is available below - thanks!

 

2.4.0.2225

Avionics and Systems

 

Reworked roll PID behaviour

Retuned roll channel for all variants in accordance with new roll PID behaviours

Reworked A/THR: better estimation of required thrust changes, improvements to APPR mode, and improvements to SOFT ALT, fixed sluggish behaviour when moving throttle lever to limit N1/EPR

Added sim rate reset LSK

Added a “restart display” button to the launcher for instances when the systems are running, but displays have failed

Added Y HYD STEERING to the list of livery-configurable options (fnx_yellow_hydraulic_steering)

Improved rendering pipeline (removed display sync option)

Improved launcher UI around restarting displays, safe mode, and CPU rendering

Fixed the start valve position showing incorrectly when the FADEC is unpowered

Fixed incorrect handling of UserCfg.opt files

Fixed RMP standby frequencies not being settable from the simulator (e.g. via SimConnect events)

Fixed stuttering/freezes when switching ND modes/heavy rendering

Fixed INVALID WIND UPLINK not showing

Fixed DMC switching not waiting for the self test to complete

Fixed flight number showing on F-PLN when offset

Fixed metric altitudes on PFD not being rounded to the nearest 10 m

Fixed sometimes being unable to open/close cargo doors

Fixed potential crash in SimConnect code

Fixed launcher being stuck on “starting Fenix”

Art and Sound

 

Added WXR INOP sticker (visible when safe mode rendering is on, it should be off to see WXR on the ND)

Improvements to sounds, particularly CFM

Improved wind recordings and volume level across cabin and flight deck

[2024] Fixed THS wheel indicator animation looping

[2024] Fixed windows not being hidden when the cabin is disabled

[2024] Fixed cockpit text having blurry decals

[2024] Fixed D1L closing when switching walkaround modes

[2024] Fixed pilot not being visible

[2024] Fixed A319/A321-specific cockpit decals not being used

[2024] Fixed incorrect A321 speed placard

[2024] Fixed incorrect wing emergency exit roughness on A319

[2024] Fixed cargo door handle not locking in position

[2024] Fixed holes in A321 cabin

[2024] Fixed right landing light only turning on if the left was turned on

[2020] Fixed high altitude landing dots overlapping annunciator

[2020] Fixed maintenance bus switch not working

[2020] Fixed external power panel being closed when GPU is connected

[2020] Fixed cargo bay lights being overly reflective

Fixed hydraulics playing when switching views

Fixed cargo station decals rendering incorrectly

Fixed high altitude landing button inverted

Fixed hole in latch when cockpit door closed

Fixed cargo door handle not opening far enough

EFB

 

Added synchronisation of imported flight plan between all EFB instances

Added EFB sleeping when activating Cold and Dark panel state

Improved resilience of EFB connection to systems

Fixed duplicate preliminary loadsheets sending

Fixed METARs being fetched for invalid airports

Fixed errors in loadsheet generation

Fixed errors when attempting to load custom PDFs

Fixed weights being modifiable when boarding is in progress or finished

Fixed user fuel changes not being applied to loadsheets

 

 

Sounds like another good update. Looking forward to trying out the improved autothrust.

Impressive

15 minutes ago, RNAVV19R said:

Sounds like another good update. Looking forward to trying out the improved autothrust.

it is, enroute now EGLL LEIB in the 321

Very nice patch ! 

Anyone yet tried this patch? My MSFS2024 crashes during start after I have done the Fenix update...

1 hour ago, DAD said:

it is, enroute now EGLL LEIB in the 321

Any changes in performance ? 

I feel the performance has improved and is more stable, although I have had a CTD out of LEPA.

2 hours ago, DieselTen said:

Anyone yet tried this patch? My MSFS2024 crashes during start after I have done the Fenix update...

i had the same problem, i deleted the wasm folder for a320 and it sorted the problem out.

2 hours ago, Ozzie94 said:

I feel the performance has improved and is more stable, although I have had a CTD out of LEPA.

NP here, I am currently running LEPA to EHAM.

3 hours ago, Fromage_Flippant said:

i had the same problem, i deleted the wasm folder for a320 and it sorted the problem out.

I am also having the same problem. Where is the A320 WASM folder?

After the update, running fine, no issues. 

Well, today I had 2 great flights, the first in the INIBUILDS A359 from LEMD to LPPT, which was really a charm!, and then I pushed the FENIX 320 update and made a LPFR - LPPT.

Both feel and perform great!

I was somehow puzzled by a feel of having inadvertently enabled FG in my FS 2024 because when looking at the digits in the PFD of the FENIX 320, or even when adjusting ALT in the FCU, it looks like it has that fuzzy feel of Frame Generation / DLSS ???

Checked my graphics settings and they surely are TAA, no DLSS...

12 hours ago, sniper31 said:

I am also having the same problem. Where is the A320 WASM folder?

mine are here, replace with DAD with Sniper 🙂 

C:\Users\DAD\AppData\Local\Packages\Microsoft.Limitless_8wekyb3d8bbwe\LocalState\WASM

Note there are (in my case only?) 2 subfolders, MSFS2020 and MSFS2024. Depending on the Fenix and thus MSFS version you use. In my case in MSFS2024:

C:\Users\DAD\AppData\Local\Packages\Microsoft.Limitless_8wekyb3d8bbwe\LocalState\WASM\MSFS2024\fnx-aircraft-320

Edited September 3, 2025Sep 3 by DAD