The BT Openreach supplied ECI Telecom VDSL modem VG3503J-V1 has LEDE firmware available, but not yet for the -V2 model. OpenWRT has firmware for both models. What is the difference between V1 and V2 and is it possible to use the -V2 with LEDE? Thanks.
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Since 9d0608eef3e5b9fca19ece2c5fcc90659f8630a6 the image works for V1 and V2. Please take care of the change install instructions: https://git.lede-project.org/17094e9e642ffca19c6b6681766d2bcbb8e6e565
Unfortunally there is an typo in the commit message. The correct syntax for the erase command is:
VR9 # erase 0xb0020000 +$(filesize)Thank you - I will try it on my ECI VG3503J V2 in the next few days. Listing number 161 on https://lede-project.org/toh/views/toh_fwdownload needs updating as it is currently blank, suggesting that the V2 is not supported.
Can Confirm LEDE works on both the V1 & V2.
LEDE automatically detects the correct drivers so just the one image is needed 
Wonder if anyone can help, I tried to flash my VG3503J with the latest version of LEDE, seemed to go well but wouldn't boot - stupidly removed the ping 1.1.1.1 command from the env and now it's stuck in a boot loop and I can't seem to interrupt the bootloader to try flashing again.
Am I SoL and need to try and attempt a JTAG recovery, or is there some neat trick where I can get back into the V9 prompt?
fwiw, I finally upgraded from Chaos Calmer to LEDE 17.01.4 on my V1 after discovering this thread for the solution.
I've updated the wiki to hopefully help others.
https://openwrt.org/toh/bt/vg3503j
The LAN1 and LAN2 ports appear to be transposed in LuCI when using LEDE and OpenWRT 18.06.0 snapshot on my V1. @mkresin is looking for any V2 owner to confirm whether or not the LAN ports are transposed. Update: this has been fixed for OpenWRT 18.06.0.