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+# backup database and media
+sudo vim /etc/apt/sources.list.d/iggdrasil.list
+# buster -> bullseye
+sudo apt update
+sudo apt upgrade
+screen  # data migration is long...
+# for each instance in /etc/ishtar/instances
+cd /srv/ishtar/{instance_name}
+# update fixtures
+./manage.py loaddata /usr/share/python3-django-ishtar/fixtures/initial_data-auth-fr.json 
+# migrate to new geo management
+./manage.py migrate_to_geo_v4 --process {number_of_thread}  # number_of_thread depend on your CPU
+# edit profile type permissions for geovectordata
+-> http(s)://{my-ihstar}/admin/ishtar_common/profiletypesummary/
+\ No newline at end of file