so i was successfully able to unlock the ZTE F670Lv9.0:
1. go to this page and download/clone the repo
GitHub - douniwan5788/zte_modem_tools: tools for zte modem
2. open a terminal in the downloaded folder and enter the following command
"python -m venv .venv source ./.venv/bin/activate
pip install -r requirements.txt
python zte_factroymode.py -u admin -p admin --ip 192.168.1.1 telnet"
you shoud get some username and pass use it to login to telnet
for the user you should copy after = and before & and for pass you need to copy after = and before \
3. after login use this command "setmac 4 198/upgradetest sdefconf 198" this will change the webui config like stock and unlock the
ont
Note: after succesful unlocking al the settings will be reverted to default