installing pmbootstrap

https://wiki.postmarketos.org/wiki/Installing_pmbootstrap

apk add python3 coreutils procps
pip3 install --user pmbootstrap

edit shell config to add .local/bin to PATH

if [ -d "$HOME/.local/bin" ] ; then
    PATH="$HOME/.local/bin:$PATH"
fi

test pmbootstrap
pmbootstrap --version

initialization

pmbootstrap init

1. Select device
2. Select user interface
3. Select workpath that has a few gigs available
4. Use the rest of the default settings

install

pmbootstrap install --sdcard=/dev/mmcblk0

NOTE: for phosh you must use all numbers in your password or the screenlocker will break

finishing up

pmbootstrap shutdown

upgrade release

Currently there is no supported and safe way to upgrade between postmarketOS releases, so we provide instructions on how to backup your data before you either begin a manual upgrade or reinstall a newer version.
rsync -avz --exclude=.cache <ip address of your phone>:/home/<your username>/ ~/backup/

Then simply install the new version and restore your files:
rsync -avzu ~/postmarketOS_backup/ <ip address of your phone>:/home/<your username>/