Me and [MENTION=127605]CuriousDevil[/MENTION] tried flashing a J1 modem. Did not brick, but the modem was scrap since it refused to connect to the internet, and the lights were wonky.I did exactly as suggested in your post and flashed my DSL-2750U HW J1 successfully. But the Lan ports don't work now and the lights of the router have changed their responses apart from DSL and Internet lights.
But I can surely connect and it's better than stock PTCL firmware. I managed to also find the latest update at D'link South Africa ftp portal ftp://ftp.d-link.co.za/DSL/DSL-2750...n T/T3/DSL-2750u_Firmware_AF_2.01_R03_Latest/ and flashed it successfully.
Furthermore I have noticed that both of the T3 updates I did, they didn't have any ".img" extension, in fact they didn't have any extension at all. While I tried to upload the image file with ".img" extension it failed but T3 didn't have any extension so it worked. I think PTCL router should be upgraded without those .img extensions. If you have a firmware that comes with the extension then remove the extension and upload it (only if with the .img extension, it fails).
Last thing, Dlink Middle East support website shows DSL-2750U HW J1 but firmware is not available. D-Link
The chipset, partition sizes and everything is identical on both the T3 and J1, but the outside body of the J1 is different and obviously something else was too considering it didn't work.
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On real fiber optics, it works fantastically, but if your exchange and/or fiber cabinet has crap equipment, it will always be a pain in the ass.Is it true that PTCL Broadband works better on Fibre Optics than a Copper Cable or it's still pain in the a** ?