Netgear CM3000 Partial Upstream OFDMA Lock (Only One Channel) After Tech Reprovision & Factory Reset – Upload Capped ~36-67 Mbps on Gigabit

I have a Netgear Nighthawk CM3000 cable modem on the Gigabit x2 plan (2000 Mbps down / 250 Mbps up). After a field tech came out and attempted reprovisioning, plus multiple chat/phone attempts and a full factory reset on the modem, the upstream is still only partially provisioned.

Current modem status (from 192.168.100.1 > Cable Connection):

•  Downstream: 32 QAM256 channels fully locked + 2 OFDM channels locked (good power/SNR, zero uncorrectables).

•  Upstream Bonded Channels: 4 ATDMA channels locked (frequencies around 16-35 MHz, power ~49.5 dBmV).

•  Upstream OFDMA Channels: Only one channel locked (profile 12,13 at ~36.2 MHz, power ~43-44 dBmV). The second channel is Not Locked (0 Hz / 0 dBmV).

Speeds are inconsistent:

•  iPhone on Wi-Fi 6E (6 GHz band) occasionally bursts to ~1200 down / ~290 up (Ookla).

•  MacBook Air wired/wireless typically gets ~300 down / ~36-67 up.

•  Direct Ethernet to modem (bypassing router): ~550 down / ~20 up.

This matches the partial upstream OFDMA lock—legacy ATDMA fallback caps upload around 35-40 Mbps consistently, with occasional bursts when the single OFDMA channel is utilized.

The modem is on the Xfinity approved list for multi-gig with mid/high-split enhanced upload. Signals are clean (downstream power 0 to +3 dBmV, upstream ~49 dBmV), no critical errors in event log, and the modem reboots cleanly after reset.

Multiple reprovisions (including by field tech) keep sending an incomplete bootfile/config that doesn’t fully lock both upstream OFDMA channels or apply the complete Next Gen Speed profile.

Please escalate this to Tier 2 provisioning or network engineering so they can:

•  Verify the current bootfile assigned to this modem.

•  Manually push the correct Next Gen/enhanced upload bootfile/CMTS config to enable full upstream OFDMA bonding (both channels locked).

Happy to DM account details, modem MAC (last 4 digits if needed), or full screenshots for privacy. Thanks for the help—really need this resolved.