Go to your existing fastboot and enter the following command
fastboot flash lk lk-rui2.imgOr make recovery flashable by replacing the lk.img in this zip with this (rename lk-rui2.img to lk.img)
ZZ Zzz Stuff @zzzstuff · 162 subscribers 𝙰𝚗𝚝𝚊𝚐𝚘𝚗𝚒𝚣𝚣𝚣𝚝 lk-rui2.img
fastboot flash lk lk-rui2.img