@pohokolius@mastodon.cloud Thanks! Acc to their wiki; Sufficient Flash to accommodate OpenWrt firmware image:
- 4MB min (won't be able to install GUI (LuCI))
- 8MB better (will fit GUI and some other applications)
Sufficient RAM for stable operation:
- 32MB min, 64MB better
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So, it seems good enough to work acceptable. I was about to buy a new router, this time with OpenWRT in mind from start. But 2nd thought today is I can first give my "old" router a shot and see how OpenWRT works before new purchase.