Teracube 2e build on a newer Android base

I understand that so far our attempts to upgrade the Teracube 2e to a newer base than Android 12 has left it unbootable.

Teracube themselves have released Android 15 builds recently in case anything there may help us.

Here is their thread on the new Android 15 build: https://community.myteracube.com/t/android-15-0-1-for-teracube-2e-2nd-batch-emerald-sn-2021/12022

And here is our forum thread in case any testing or feedback from the community is needed: https://community.iode.tech/t/upgrade-android-teracube-2e/4726/10?u=rik

Here is a link to /e/'s announcement of a A12 ==> A15 upgrade in testing in their development update: https://community.e.foundation/t/week-49-2025-development-and-testing-updates/77748