The Netgear VEVG2500 is a hard to find device, but it does/did exist, presumably distributed by ISPs in France/Italy/etc. The Netgear VEVG3700 seems to be its successor, but it's chipset is unknown. Finally the DGND3700 is referred to as the successor to the VEVG3700, and sadly the DGNG is Broadcom-based, which means: there are no VDSL2-drivers for the newer devices.
Like stated in the OpenWrt forum it's GPL-dump VEVG2500_v07.00.02_with_Toolchain_src.zip could serve for finally supporting the Lantiq VR9-SoC via the
ltq-dsl-package, which would add support for the first VDSL2 modem.
OpenWrt support status: Not supported
The router i found is branded numericable (french isp) following request give interesting result in serial console:
POST http://192.168.0.1/num/wizardBack.asp (context lanip=192.168.0.1<color #ed1c24>;busybox</color>&page=saveLanIP)
|Green||Power led||488||Active low|
|Green||link led||?||Active low|
|Green||Info led||496||Active low|
|Green||Ethernet led||493||Active low|
|Green||Tel1 led||?||Active low|
|Green||Tel2 led||483||Active low|
|Green||Mail led||?||Active low|
→ port.serial general information about the serial port, serial port cable, etc.
Serial console is J504. Settings are: 115200, 8, n, 1 Serial Port is 3.3v use TTL adapter
short R302 to enter UART CFG02 mode