To use the router on a different fiber network, you must spoof the new carrier’s approved ONT serial number.
# View current GPON SN
sendcmd 1 GPON show
Some fiber networks (like GPON) authenticate via the device’s MAC address rather than the SN. To unlock your ZTE F670L for a new ISP, you need to clone the MAC address of a router approved by that ISP.
Most people think they are “locked out” when they really just don’t have the super-admin password. Try this first. how to unlock zte f670l
If your new ISP uses GPON:
On ZTE F670L (with super admin access), go to:
Network > GPON Settings
Change SN / LOID / Password to match old ONT.
If your new ISP requires the router to "register" on their OLT, you must spoof the old ISP’s credentials. To use the router on a different fiber
Via Telnet:
After gaining Telnet access (Method 2), type:
setmac show
This lists your current identifiers:
To change these for your new ISP:
setmac 1 2177 [New LOID]
setmac 1 2178 [New LOID Password]
setmac 1 512 [New Vendor ID]
setmac 1 2048 [New GPON SN]
sendcmd 1 DB save
reboot
Critical: You must get the correct identifiers from your new ISP’s authorized ONT. Without them, the fiber OLT will reject the connection (LOS blinking red). On ZTE F670L (with super admin access), go
After success: You have a completely unlocked router with stock ZTE firmware. You can now configure any ISP’s settings manually.
sendcmd 1 GPON set 0 0 VendorID ZTEG
sendcmd 1 GPON set 0 1 GPSN NEWSN