Will do this as soon as I get home. Thanks for the replyhi,
for first time (clean !) flashing this rom drive.google.com/open?id=1s8gpR2LwrzyFgQN-lqiG4_Qs5Pj854aR"]lineage-15.1-20190906-UNOFFICIAL-mako-signed
the instructions you mentioned are fully OK
or follow these instructions wiki.lineageos.org/devices/mako/install, whichever is more convenient to you
note: you don't have to migrate keys by script ( as you already did a full wipe of data, cache and system partitions )