Edit /etc/passwd:
echo "root::0:0:root:/:/bin/sh" > /etc/passwd
Then kill telnetd and restart: no password needed. zte f670y firmware hot
The version check is in /usr/bin/version_check. Patch it: Then kill telnetd and restart: no password needed
mount -o remount,rw /
cp /bin/busybox /tmp/sh
/tmp/sh -c "sed -i 's/version_check/echo 0/' /usr/bin/version_check"
Now flash any older firmware.
| Binary | Purpose | Notable |
|--------|---------|---------|
| /bin/zte_omci | OMCI (ONT Mgmt) daemon | Communicates with OLT, can reflash firmware |
| /usr/sbin/httpd | Web server (GoAhead) | Hardcoded URLs for debug: /hidden_version_sec.htm |
| /zte/cspd | ZTE service platform | Handles TR-069, remote CLI |
| /zte/voice/voipd | SIP stack | Insecure credential storage (plaintext in /etc/voice_passwd) | Now flash any older firmware