Upgrade from old version (6) to new one

1

How can we upgrade our old system version 6 to new one without loosing anything of our database and in the same times all customized solutions in old version implement in new version
Many thanks.

2

update to major release ex. v12 → v13
nodejs >= 10 required (u can use 12)

cd ~ 
curl -sL https://deb.nodesource.com/setup_12.x -o nodesource_setup.sh 
sudo bash nodesource_setup.sh 
sudo apt install nodejs nodejs -v

now upgrade

cd ~/frappe-bench bench switch-to-branch version-13-beta frappe erpnext --upgrade 
bench update --patch 
bench migrate 
sudo bench --site <my site> migrate
bench update --build
bench clear-cache-
bench website-clear-cache

sudo supervisorctl reload
sudo service nginx reload

if required upgrade Venv

sudo -H pip3 install --upgrade pip
bench migrate-env python3
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