[Nexus 6 Q&A, Help & Troubleshooting] jamiejones85:
I was using the stock rom with Franco kernel for months, NFC and android pay was working, I used it most days. I decided to try PureNexus and PureZ but NFC wouldn't switch on in either. I've also tried lineageos. Each time with factory resets. I've already tried flashing different radio version to no avail.

I've now re-flashed shamu-n6f27m and installed Franco kernel but NFC still will not stay on.

Radio: MDM9625_104670.31.05.45R

Build: M6F27M

Kernel: 3.10.40-FrancoKernel#75

Logcat Snippet:

04-30 19:49:12.836 883 1383 E PowerHAL: touch_boost: failed to send: No such file or directory

04-30 19:49:12.849 4479 4479 D WirelessSettings: onPreferenceTreeClick: preference=NFC Allow data exchange when the phone touches another device

04-30 19:49:12.849 2033 5463 I NfcService: Enabling NFC

04-30 19:49:12.861 2033 5463 E NfcAdaptation: NfcAdaptation::Initialize: ver=NFCDROID-AOSP_N_00.01 nfa=NFA_PI_1.03.66+

04-30 19:49:12.862 2033 5516 I BrcmNfcNfa: NFC_TASK started.

04-30 19:49:12.862 2033 5463 E NfcAdaptation: No HAL module specified in config, falling back to BCM2079x

04-30 19:49:12.864 2033 5463 E NfcNciHal: HaiInitializeLibrary: ver=NFCDROID-AOSP_N_00.01 nfa=NFA_PI_1.03.66+

04-30 19:49:12.869 2033 5463 I USERIAL_LINUX: USERIAL_Init

04-30 19:49:12.869 2033 5463 I NfcNciHal: HAL_NfcInitialize (): NFC_HAL_TASK id=0

04-30 19:49:12.870 2033 5517 I NfcNciHal: NFC_HAL_TASK started

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: nfa_dm_init ()

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: nfa_sys_register () id=1, enable_cplt_mask=0x0

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: nfa_sys_register () id=3, enable_cplt_mask=0x8

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: nfa_rw_init ()

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: nfa_sys_register () id=6, enable_cplt_mask=0x48

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: nfa_ce_init ()

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: nfa_sys_register () id=7, enable_cplt_mask=0xc8

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: nfa_ee_init ()

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: nfa_sys_register () id=2, enable_cplt_mask=0xcc

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: LLCP - llcp_init ()

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: num_rx_buff = 9, rx_congest_start = 6, rx_congest_end = 4, max_num_ll_rx_buff = 2

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: max_num_tx_buff = 21, max_num_ll_tx_buff = 6

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: LLCP_RegisterServer (): SAP:0x1, link_type:0x2, ServiceName:<urn:nfc:sn:sdp>

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: LLCP_RegisterServer (): Registered SAP = 0x01

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: NFA_Enable ()

04-30 19:49:12.870 2033 5463 I BrcmNfcNfa: NFC_SetTraceLevel () new_level = 1

04-30 19:49:12.870 2033 5517 I USERIAL_LINUX: USERIAL_Open(): enter

04-30 19:49:12.870 2033 5517 I USERIAL_LINUX: USERIAL_Open() device: /dev/bcm2079x-i2c port=5, uart_port=0 WAKE_DELAY(20) WRITE_DELAY(20) POWER_ON_DELAY(50) PRE_POWER_OFF_DELAY(10) POST_POWER_OFF_DELAY(0)

04-30 19:49:12.931 2033 5517 I USERIAL_LINUX: USERIAL_Open(): exit

04-30 19:49:12.942 2033 5517 E USERIAL_LINUX: USERIAL_Write len = 4, ret = -1, errno = 5

04-30 19:49:14.996 2033 5463 D : phNxpLog_InitializeLogLevel: global =1, Fwdnld =1, extns =1, hal =1, tml =1, ncir =1, ncix =1

04-30 19:49:14.997 2033 5463 E BrcmNfcJni: nfcManager_doInitialize: fail nfa enable; error=0x0

04-30 19:49:15.899 2033 5516 I BrcmNfcNfa: GKI TASK_DEAD received. exit thread 3...

04-30 19:49:16.036 423 666 D audio_hw_primary: disable_audio_route: usecase(1) reset and update mixer path: low-latency-playback speaker

04-30 19:49:16.039 423 666 D audio_hw_primary: disable_snd_device: snd_device(2: speaker)

04-30 19:49:16.100 2033 5463 W NfcService: Error enabling NFC

04-30 19:49:23.327 883 899 E BatteryStatsService: power: Missing API

04-30 19:49:23.350 883 899 E BatteryStatsService: modem info is invalid: ModemActivityInfo{ mTimestamp=0 mSleepTimeMs=0 mIdleTimeMs=0 mTxTimeMs[]=[0, 0, 0, 0, 0] mRxTimeMs=0 mEnergyUsed=0}

04-30 19:49:25.509 883 1398 I WifiHAL : Got channel list with 13 channels

04-30 19:49:25.512 883 1398 I WifiHAL : Got channel list with 4 channels

04-30 19:49:25.515 883 1398 I WifiHAL : Got channel list with 15 channels

Full log attached

If anyone can suggest something, I'm all ears.