[Nexus 9 Q&A, Help & Troubleshooting] USBhost:
Wow that's something you don't see everyday....

[ 31.074029] found wifi platform device bcm4329_wlan
[ 31.074046] unregister wifi platform drivers
[ 31.074094] dhd_module_init: Failed to load the driver, try cnt 1
[ 31.074207] found wifi platform device bcm4329_wlan
[ 31.074434] Power-up adapter 'DHD generic adapter'
[ 31.074476] wifi_platform_set_power = 1
[ 31.074492] flounder_wifi_power: 1
[ 31.380496] wifi_platform_bus_enumerate device present 1
[ 33.380485] failed to power up DHD generic adapter, 3 retry left
[ 33.396608] wifi_platform_set_power = 0
[ 33.396628] flounder_wifi_power: 0
[ 33.497077] wifi_platform_bus_enumerate device present 0
[ 33.497137] wifi_platform_set_power = 1
[ 33.497153] flounder_wifi_power: 1
[ 33.803833] wifi_platform_bus_enumerate device present 1
[ 35.803940] failed to power up DHD generic adapter, 2 retry left
[ 35.820048] wifi_platform_set_power = 0
[ 35.820067] flounder_wifi_power: 0
[ 35.920592] wifi_platform_bus_enumerate device present 0
[ 35.920648] wifi_platform_set_power = 1
[ 35.920666] flounder_wifi_power: 1
[ 36.227139] wifi_platform_bus_enumerate device present 1
[ 38.227168] failed to power up DHD generic adapter, 1 retry left
[ 38.243300] wifi_platform_set_power = 0
[ 38.243320] flounder_wifi_power: 0
[ 38.343735] wifi_platform_bus_enumerate device present 0
[ 38.343797] wifi_platform_set_power = 1
[ 38.343814] flounder_wifi_power: 1
[ 38.650518] wifi_platform_bus_enumerate device present 1
[ 40.650406] failed to power up DHD generic adapter, 0 retry left
[ 40.666528] wifi_platform_set_power = 0
[ 40.666547] flounder_wifi_power: 0
[ 40.677534] INFO: task kworker/0:1:18 blocked for more than 10 seconds.
[ 40.677561] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 40.677589] kworker/0:1 D ffffffc000086904 0 18 2 0x00000000
[ 40.677663] Workqueue: events request_firmware_work_func
[ 40.677691] Call trace:
[ 40.677726] [<ffffffc000086904>] __switch_to+0x74/0x8c
[ 40.677758] [<ffffffc0009eb8a8>] __schedule+0x2e8/0x854
[ 40.677779] [<ffffffc0009ebe3c>] schedule+0x28/0x68
[ 40.677799] [<ffffffc0009e9f68>] schedule_timeout+0x1d4/0x284
[ 40.677820] [<ffffffc0009ec598>] wait_for_common+0xb8/0x15c
[ 40.677843] [<ffffffc0009ec650>] wait_for_completion+0x14/0x1c
[ 40.677864] [<ffffffc00047c97c>] _request_firmware+0xa60/0xcf0
[ 40.677885] [<ffffffc00047cc50>] request_firmware_work_func+0x28/0x54
[ 40.677911] [<ffffffc0000cf580>] process_one_work+0x13c/0x474
[ 40.677932] [<ffffffc0000cf9f4>] worker_thread+0x13c/0x3c0
[ 40.677956] [<ffffffc0000d70ac>] kthread+0xcc/0xd4
[ 40.677998] INFO: task kworker/0:2:85 blocked for more than 10 seconds.
[ 40.678014] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 40.678030] kworker/0:2 D ffffffc000086904 0 85 2 0x00000000
[ 40.678076] Workqueue: events request_firmware_work_func
[ 40.678099] Call trace:
[ 40.678120] [<ffffffc000086904>] __switch_to+0x74/0x8c
[ 40.678140] [<ffffffc0009eb8a8>] __schedule+0x2e8/0x854
[ 40.678174] [<ffffffc0009ebe3c>] schedule+0x28/0x68
[ 40.678193] [<ffffffc0009e9f68>] schedule_timeout+0x1d4/0x284
[ 40.678258] [<ffffffc0009ec598>] wait_for_common+0xb8/0x15c
[ 40.678279] [<ffffffc0009ec650>] wait_for_completion+0x14/0x1c
[ 40.678299] [<ffffffc00047c97c>] _request_firmware+0xa60/0xcf0
[ 40.678319] [<ffffffc00047cc50>] request_firmware_work_func+0x28/0x54
[ 40.678340] [<ffffffc0000cf580>] process_one_work+0x13c/0x474
[ 40.678362] [<ffffffc0000cf9f4>] worker_thread+0x13c/0x3c0
[ 40.678382] [<ffffffc0000d70ac>] kthread+0xcc/0xd4
[ 40.678402] INFO: task kworker/u4:1:87 blocked for more than 10 seconds.
[ 40.678417] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 40.678434] kworker/u4:1 D ffffffc000086904 0 87 2 0x00000000
[ 40.678486] Workqueue: fwu_workqueue fwu_startup_fw_update_work
[ 40.678509] Call trace:
[ 40.678530] [<ffffffc000086904>] __switch_to+0x74/0x8c
[ 40.678550] [<ffffffc0009eb8a8>] __schedule+0x2e8/0x854
[ 40.678570] [<ffffffc0009ebe3c>] schedule+0x28/0x68
[ 40.678590] [<ffffffc0009e9f68>] schedule_timeout+0x1d4/0x284
[ 40.678611] [<ffffffc0009ec598>] wait_for_common+0xb8/0x15c
[ 40.678631] [<ffffffc0009ec650>] wait_for_completion+0x14/0x1c
[ 40.678651] [<ffffffc00047c97c>] _request_firmware+0xa60/0xcf0
[ 40.678672] [<ffffffc00047cc20>] request_firmware+0x14/0x1c
[ 40.678693] [<ffffffc000635454>] synaptics_fw_updater+0x3e0/0x8b0
[ 40.678713] [<ffffffc000636100>] fwu_startup_fw_update_work+0x24/0x50
[ 40.678734] [<ffffffc0000cf580>] process_one_work+0x13c/0x474
[ 40.678754] [<ffffffc0000cf9f4>] worker_thread+0x13c/0x3c0
[ 40.678774] [<ffffffc0000d70ac>] kthread+0xcc/0xd4
[ 40.767142] wifi_platform_bus_enumerate device present 0
[ 40.767181] failed to power up DHD generic adapter, max retry reached**

It looks like something happened to your wifi card that it can't poweron.

There's really nothing you can do in the software side of things sorry.

You can try replacing the motherboard but that's like 1/3 the cost of the tablet.....

Or send it in to repair, do you still have warranty? I know you rooted your device but who knows right :laugh:

Sorry for the bad news...

If none of those are options you can always just use ethernet.