the ALLY-R1900 has 16MB flash and 16MB RAM so mini/std should be fine, maybe big it depends on bloat
Both R1900 and DIR-882use the same MediaTek CPU, radios
tho ALLY-R1900 only implements 3 of 4 tx/rx chains/ spatial streams offered by the MT7615N for 802.11ac.
ALLY-R1900 max. ~1300Mbps 802.11ac on 5GHz while DIR-882 or DIR-878 supports 1733Mbps link rates
... it seems the 'manufacturer is dead` or decided to not support it
while supposedly 2018-01-22 firmware 1.10.02 with KRACK fix exist
yet those recent files are missing from any of theirs website(s)
i got 5 older firmware .bin files (~12MB) for analysis if anyone is curious
of course it also has always-on the obsolete build of dnsmasq
thus i was wondering if DD-WRT has the power to keep it alive and if i can help somehow?