I need to install openwrt on a Mikrotik Groove A-52HPn. No firmware so far has worked.
Is there any indication, anywhere, of it being supported?
Have you tried booting https://openwrt.org/toh/hwdata/mikrotik/mikrotik_rb911-5hn_911_lite5 via initramfs or
Potentially it was added when the SXT and RB911 series was added as they are a similar chipset etc.
Your biggest issue going forward is 16mb of flash and the 64mb RAM