1) Download the file from my Google Drive -
HERE (New link added)
2) Make sure your electricity won't go at any random moment.
3) Connect to your modem via Ethernet cable.
4) Log in to the PTCL web portal.
5) Click on Management, then Update Software.
6) Choose file, select the file you downloaded.
7) Proceed to update.
8) The power LED will turn red, everything is fine. It will stay red for 2-3 minutes. Once it's green, unplug your ethernet cable.
9) After about a minute, re-connect your ethernet cable.
10) Open the browser, type 10.0.0.2 (which will be the new gateway/LAN IP for your modem)
11) Enter your VPI/VCI and PPPoE settings (0/103 for Copper and 8/81 for ONU/Fiber)
12) Press finish setup wizard.
13) Wait for it to connect.
14) Once it shows an IP address under IPv4 Address (WAN). You're all set.