I have successfully installed OpenWRT 21.02.1 on a FRITZ!Box WLAN 3370 (Hynix image). However, the WAN connection will not come up. My ISP is Deutsche Telekom, I used "dsl0.7" as my WAN interface name. Internet access using the same line and same OpenWRT version and identical configuration (as far as I can tell) is working fine with a BT HomeHub 5a. I did even try a different FRITZ!Box WLAN 3370 with the same result. LuCI tells me "Network device is not present" in Network -> Interfaces (WAN section). One thing I have noticed is that the "WAN" port is not listed in the switch overview page in LuCI (it is listed on the HomeHub).
ps. the 3370 does not possess a separate WAN ethernet port, unlike HH5a, hence why the switch configuration menu in LuCI does not show the 5th ethernet port on 3370.
The status information on 19.07.08 looks somewhat different, but it conveys the same failure:
ATU-C Vendor ID:
ATU-C System Vendor ID:
Chipset: Lantiq-VRX200
Firmware Version: 5.7.9.9.0.6
API Version: 4.17.18.6
XTSE Capabilities: , , , , , , ,
Annex:
Line Mode:
Profile:
Line State: DOWN [0x200: silent]
Forward Error Correction Seconds (FECS): Near: 0 / Far: 0
Errored seconds (ES): Near: 0 / Far: 0
Severely Errored Seconds (SES): Near: 0 / Far: 0
Loss of Signal Seconds (LOSS): Near: 0 / Far: 0
Unavailable Seconds (UAS): Near: 64 / Far: 62
Header Error Code Errors (HEC): Near: 0 / Far: 0
Non Pre-emtive CRC errors (CRC_P): Near: 0 / Far: 0
Pre-emtive CRC errors (CRCP_P): Near: 0 / Far: 0
Power Management Mode: L3 - No power
Latency [Interleave Delay]: 0.0 ms [Fast] 0.0 ms [Fast]
Data Rate: Down: 0 b/s / Up: 0 b/s
Line Attenuation (LATN): Down: 0.0 dB / Up: 0.0 dB
Signal Attenuation (SATN): Down: 0.0 dB / Up: 0.0 dB
Noise Margin (SNR): Down: 0.0 dB / Up: 0.0 dB
Aggregate Transmit Power (ACTATP): Down: 0.0 dB / Up: 0.0 dB
Max. Attainable Data Rate (ATTNDR): Down: 0 b/s / Up: 0 b/s
Line Uptime Seconds: 0
Line Uptime: down
I tried different tone settings and encapsulation modes -- to no avail (also, it works on my HH5a when everything is left on auto).
Changing the interface name to "wan" did not help things either.
Usually in these cases I would suspect a faulty hardware or faulty cable setup, but, as I said, the OEM firmware very reliably establishes an internet connection (on both devices I own).
I found this link in google. Read the comments at the end, where someone has encountered the same issue with no sync. Solution is to use a different blob.
It's actually the one from the 3370 firmware. But others don't seem to work either. Also, in my experience, the blob included in OpenWRT works but without vectoring (it syncs with a max speed of 20 mbit/s)
Same experience here. Non-Vectoring-capable VDSL2-modems will be forced to use a Profile that only uses the sub-carriers up to ~2.2MHz as these are exempted from vectoring so that ISPs do not need to replace old vectoring-incompatible ADSL-modems out in the field. But it will still use VDSL2/PTM and will not fall-back to ADSL....