: If the update fails mid-way due to a power cut, you may need to use advanced USB flashing tools or multicast upgrade software to push the firmware back onto the device. To help narrow down the exact file you need, tell me:

If you are looking for custom firmware to unlock the router from a specific carrier (e.g., Vodafone, Orange, MTN) to a generic, network-unlocked version, you would typically look for on technical forums such as GSM-Forum or 4PDA .