Linux kernel 4.14+ for BPI-R2, 5.4+ for R64, 6.1+ for R2Pro and R3, 6.12+ for R4, 6.17+ for R4Pro/R4Lite
frank-w/BPI-Router-Linux has 200 GitHub stars.
It currently ranks #15768 daily, #16677 weekly, #19745 monthly by momentum on Trending Repos; its best-ever rank is #6509.