I’ve found dmesg on terminal:
[ 29.995259] NET: Registered protocol family 24
[ 30.015868] pci 0000:00:02.0: enabling device (0140 -> 0142)
[ 30.023898] ath10k_pci 0000:02:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[ 30.264017] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:02:00.0.bin failed with error -2
[ 30.274772] ath10k_pci 0000:02:00.0: Falling back to user helper
[ 30.536590] firmware ath10k!pre-cal-pci-0000:02:00.0.bin: firmware_loading_store: map pages failed
[ 30.545713] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/cal-pci-0000:02:00.0.bin failed with error -2
[ 30.556157] ath10k_pci 0000:02:00.0: Falling back to user helper
[ 30.566649] firmware ath10k!cal-pci-0000:02:00.0.bin: firmware_loading_store: map pages failed
[ 30.575448] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/firmware-6.bin failed with error -2
[ 30.586199] ath10k_pci 0000:02:00.0: Falling back to user helper
[ 30.596679] firmware ath10k!QCA988X!hw2.0!firmware-6.bin: firmware_loading_store: map pages failed
[ 30.605771] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/firmware-5.bin failed with error -2
[ 30.616517] ath10k_pci 0000:02:00.0: Falling back to user helper
[ 30.626940] firmware ath10k!QCA988X!hw2.0!firmware-5.bin: firmware_loading_store: map pages failed
[ 30.636033] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/firmware-4.bin failed with error -2
[ 30.646775] ath10k_pci 0000:02:00.0: Falling back to user helper
[ 30.657178] firmware ath10k!QCA988X!hw2.0!firmware-4.bin: firmware_loading_store: map pages failed
[ 30.666269] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/firmware-3.bin failed with error -2
[ 30.677007] ath10k_pci 0000:02:00.0: Falling back to user helper
[ 30.687400] firmware ath10k!QCA988X!hw2.0!firmware-3.bin: firmware_loading_store: map pages failed
[ 30.696488] ath10k_pci 0000:02:00.0: Direct firmware load for ath10k/QCA988X/hw2.0/firmware-2.bin failed with error -2
[ 30.707226] ath10k_pci 0000:02:00.0: Falling back to user helper
[ 30.717615] firmware ath10k!QCA988X!hw2.0!firmware-2.bin: firmware_loading_store: map pages failed
[ 30.726667] ath10k_pci 0000:02:00.0: Failed to find firmware-N.bin (N between 2 and 6) from ath10k/QCA988X/hw2.0: -11
[ 30.737320] ath10k_pci 0000:02:00.0: could not fetch firmware files (-11)
[ 30.744130] ath10k_pci 0000:02:00.0: could not probe fw (-11)
[ 30.759497] usbcore: registered new interface driver qcserial
[ 30.765309] usbserial: USB Serial support registered for Qualcomm USB modem
I fixed this by installing kmod-ath10k-ct package as MightyWarrior suggested on Turris OS 5.0 is released!
Note: I had the -ct firmware installed before update:
root@turris:/tmp# opkg remove kmod-ath10k
Package unison version 2.51.2-1 has no valid architecture, ignoring.
Package libexpat version 2.2.9-1.0 has no valid architecture, ignoring.
Removing package kmod-ath10k from root...
WARNING: You probably just removed a package that was installed as part of a user list or the basic system. This package will return durring the next updater run. We suggest you disable the user list instead.
root@turris:/tmp# opkg install kmod-ath10k-ct
Installing kmod-ath10k-ct (4.14.180+2019-09-09-5e8cd86f-1-58f4a00531100abb0e5ec1c98b13b78d.0) to root...
Downloading https://repo.turris.cz/hbs/omnia/packages/core/kmod-ath10k-ct_4.14.180%2b2019-09-09-5e8cd86f-1-58f4a00531100abb0e5ec1c98b13b78d_arm_cortex-a9_vfpv3-d16.ipk
Installing kmod-hwmon-core (4.14.180-1-58f4a00531100abb0e5ec1c98b13b78d.0) to root...
Downloading https://repo.turris.cz/hbs/omnia/packages/core/kmod-hwmon-core_4.14.180-1-58f4a00531100abb0e5ec1c98b13b78d_arm_cortex-a9_vfpv3-d16.ipk
Configuring kmod-hwmon-core.
Configuring kmod-ath10k-ct.