According to the (mediafire) link you shared with us yesterday in your post #302, this firmware was uploaded 2024-01-17 and this is still the version 1v43 witihout 's'.
With 'release version' I literally mean that this firmware is released for all device owners
on the offical AH90 page on the manufacturers' website
http://www.gustard.cn/?post_type=products&page_id=17831. As of today, no AH90 firmware can be found there and thus I conclude there is only one 'official release' version, which is 1v43 that comes preinstalled.
I get that you are in contact with the manufacturer gustard and they are working on a release. Thanks for letting us know and this is good news! I just hope that they provide the firmware on the official website for all device owners. It cannot be that a serious company relies on 'links pointing to filesharing sites on a forum' for the rollout of their firmware. This not only confuses people but is a real security issue, as the firmware is a proper internet-connected linux os operating behind people's firewalls.
Edit: it seems that prior to my post, a manufacturer-account shared with us an improved firmware, version 1v43s. At the time of posting I could, for some reason, not see that post. I flashed that firmware to an sd card and tested it. I confirm that it indeed works flawlessly as
@Deutschefach mentioned. Tidal also works
@rfgdelion . A quick look at darkstat did not show any abnormal network traffic. Still, I hope to see that published officially on the manufacturers website, together with release notes and a checksum.