you can try this,
EDIT
but with formating the /data partition
[HOWTO] Upgrade my /e/OS to major Android version → post 2
.
your initial plan was looking good
[HOWTO] a clear guide to install /e/ on a Fairphone
will be decisive..
you can try this,
EDIT
but with formating the /data partition
[HOWTO] Upgrade my /e/OS to major Android version → post 2
.
your initial plan was looking good
[HOWTO] a clear guide to install /e/ on a Fairphone
will be decisive..