Question 2017 Fire Tablet downgrade Alexa

[Dracolich]

Hello, new member here. I have an issue with the Alexa app on my 2017 Fire HD7. It runs OS 5.7.1.0 which I understand is based on Android 5.1. A few months ago I replaced the microsd card and now when I open the app all of my devices are gone, but the favorites and routines are still there, and when I try to add a device it tells me the app needs to be updated. I've tried numerous times clearing the cache and data but I still cannot add devices. The settings shows the last system update was in 2023 and the Alexa app is version 2.2.461117, and according to the apk websites I use is for Android 6.0+. I have an apk for 2.2.418281 that should work on Android 5.1 but I can't get it to install - can't find an option to uninstall the installed version. I also have the 2.2.461117 version on a Chromebook that runs Android 9 and all of my devices are listed and working from it so it's not a network problem. Is there any other way to downgrade the Alexa version? Or other tricks to try to get my devices back in the installed version?