To Update the OLT-121-64 Login to the Webui of the OLT

Go to System >>> Device Manage >>> Firmware Upgrade

First Select the .TAR file 
GPON_OLT-121-64_UPGRADE_V1.0.4_20260616_AIRLIVE_H.tar

And update the OLT, after the Firmware has been updated and the OLT rebooted.

again go to System >>> Device Manage >>> Firmware Upgrade

and now select the .UBI file

GPON_OLT-121-64_NFCUST_V1.0.4_20260616213826_AIRLIVE_H.ubi

After the Firmware has finished updating and the OLT is rebooted the Update is completed.
