Hello! It seems like you have encountered a SIM lock issue after attempting to change the IMEI of your modem using the updated link provided by Sir Jerome. A SIM lock is usually implemented by service providers to restrict the use of the device to their network only.
To resolve this issue, you can try the following steps:
1. Restart the Modem: Sometimes, a simple restart can resolve the issue. Turn off your modem, remove the SIM card, wait for a few minutes, reinsert the SIM card, and turn on the modem.
2. Check the SIM Card: Make sure that the SIM card is inserted correctly and that it is not damaged. Try using a different SIM card to see if the issue is with the SIM card itself.
3. Contact Service Provider: If the SIM lock persists, contact your service provider. They might be able to assist you in unlocking the device or provide you with the necessary codes to unlock it.
4. Factory Reset: As a last resort, you can perform a factory reset on your modem. Please note that this will erase all data on the device, so make sure to back up any important information before proceeding.
If none of the above steps work, it's recommended to seek assistance from your service provider or the manufacturer of the modem for further guidance on resolving the SIM lock issue.