I use the modified AdGuard 4.9.32 ad blocker from APKTime on my OS7 and OS8 Firesticks but have several OS6 devices (Firestick 4k Gen 1) on which it won’t install (get a “parsing error” when I try). So I installed the regular version (4.8.32 is the last one that will install) which installs on the Gen 1 4k stick for the 7 day trial. After 7 days, it’s supposed to revert to AdGuard Free but mine wont load when I try to run it. just takes me to a login page which errors out before I can log in. Cant run it so can’t get to any settings to see what might be going on.
Anybody use AdGuard Free on their Gen 1 4k sticks and getting it to work???
EDIT: There are several posts on the internet with exactly the same issue so there’s something going on here

Not quite. I run Adguard Home with custom block lists on my router, Flint 2.

Also have Amazon update IP’s blocked so my remaining Firesticks can’t update and disable alternate home launchers.