Update: UBports CI now spits out a recovery ramdisk for Halium 10.0 and up. Select your Halium generation and download the ramdisk here: https://ci.ubports.com/job/UBportsCommunityPortsJenkinsCI/job/ubports%252Fporting%252Fcommunity-ports%252Fjenkins-ci%252Fgeneric_arm64/