====== SG631Z ======

enable telnet: http://192.168.1.1/getpage.gch?pid=1002&nextpage=tele_sec_tserver_t.gch

telnet user and password: 

  admin
  chzhdpl@246

then type su command switch to root, password:

  aDm8H%MdA
  
decrypt config:
  
  sidbg 1 DB decry /userconfig/cfg/db_user_cfg.xml

then inspect decrypted config file at:

  /tmp/debug-decry-cfg

====== ZTE F657GV9 ======

https://github.com/douniwan5788/zte_modem_tools