@domubpkm I don't know what's the device of OP. Edit : as far as i can see from his previous posts, he owns a FP2, but still, don't know if it's a Halium 9 port he runs on. Edit 2 : most advanced port for FP2 is 7.1 https://forums.ubports.com/topic/6021/halium-7-1-test-channel/17

@richardg You can do it with the UBports installer. Or with TWRP if I'm correct (not really sure of this one )