Regression in Qalcomm WCN7850 wifi drivers causing driver to fail to load

There is likely a regression in the wifi driver for the WCN7850 device causing the driver to fail to load with the following messages from dmesg:

[ 2.565336] ath12k_pci 0004:01:00.0: BAR 0 [mem 0x7c400000-0x7c5fffff 64bit]: assigned
[ 2.565391] ath12k_pci 0004:01:00.0: enabling device (0000 -> 0002)
[ 2.599165] ath12k_pci 0004:01:00.0: MSI vectors: 16
[ 2.599182] ath12k_pci 0004:01:00.0: Hardware name: wcn7850 hw2.0
[ 2.838593] Modules linked in: panel_edp(+) r8152(+) leds_qcom_lpg qcom_pbs usbhid pm8941_pwrkey led_class_multicolor ath12k(+) msm ubwc_config qcom_spmi_temp_alarm snd_soc_wcd938x snd_soc_wcd938x_sdw ocmem snd_soc_x1e80100 mac80211 industrialio gpu_sched snd_soc_wcd_mbhc snd_soc_qcom_sdw drm_gpuvm soundwire_qcom snd_soc_wcd_classh snd_soc_qcom_common drm_exec regmap_sdw snd_soc_lpass_wsa_macro snd_soc_lpass_va_macro drm_dp_aux_bus snd_soc_lpass_rx_macro slimbus soundwire_bus snd_soc_lpass_tx_macro cfg80211 snd_soc_lpass_macro_common drm_display_helper snd_soc_core snd_seq_midi cec libarc4 snd_compress ac97_bus rc_core mhi qcom_tsens snd_seq_midi_event snd_pcm_dmaengine snd_pcm snd_rawmidi qcom_edac snd_seq snd_seq_device snd_timer arm_smccc_trng leds_gpio snd soundcore pwm_bl joydev input_leds sch_fq_codel efi_pstore nfnetlink ip_tables x_tables onboard_usb_dev uas usb_storage nvme nvme_core nvme_keyring nvme_auth hid_generic surface_hid surface_hid_core hid surface_battery surface_charger surface_fan xhci_plat_hcd
[ 3.142198] ath12k_pci 0004:01:00.0: chip_id 0x2 chip_family 0x4 board_id 0xff soc_id 0x40170200
[ 3.142201] ath12k_pci 0004:01:00.0: fw_version 0x110cffff fw_build_timestamp 2025-06-25 09:26 fw_build_id QC_IMAGE_VERSION_STRING=WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3
[ 3.155458] ath12k_pci 0004:01:00.0: failed to fetch board data for bus=pci,vendor=17cb,device=1107,subsystem-vendor=17cb,subsystem-device=1107,qmi-chip-id=2,qmi-board-id=255 from ath12k/WCN7850/hw2.0/board-2.bin
[ 3.155464] ath12k_pci 0004:01:00.0: failed to fetch board.bin from WCN7850/hw2.0
[ 3.155466] ath12k_pci 0004:01:00.0: qmi failed to load bdf:
[ 3.155467] ath12k_pci 0004:01:00.0: qmi failed to load board data file:-2

this might be an upstream kernel bug, however I'm reporting it here first.

I have tried both ubuntu 25.10 and 25.04 (I downgraded from 25.10 to 25.04, which I am aware is not supported) and both have the same error.

additional info (these are from 25.04, however I also experienced it on 25.10 with the latest versions as of 2025-11-08):
- linux-firmware version: 20250317.git1d4c88ee-0ubuntu1.9
- kernel: 6.17.0-6-generic
- wifi card (from lshw -C network): WCN785x Wi-Fi 7(802.11be) 320MHz 2x2 [FastConnect 7800]
- device: Microsoft Surface Laptop 7 (Snapdragon X1E80100 ARM cpu)

possibly related: 2084504, 2080428

I (as in the person writing this) am more experienced with linux and am helping them with this bug report, however the person who this device & the account belongs to is less experienced with linux, so may need some additional help & coaching.