https://repo.turris.cz/hbs/medkit/ version 2020-01-16 ('latest') is missing wifi drivers
https://docs.turris.cz/hw/omnia/rescue_modes/ points to https://repo.turris.cz/hbs/medkit/ for newbies to reflash.
[ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.14.162 (beast@slave10) (gcc version 7.3.0 (OpenWrt GCC 7.3.0 ab9d1bf)) #0 SMP Thu Jan 16 14:01:27 2020
There seems to be no wifi driver in the /lib/modules/4.14.162 directory:
fat 57344 1 vfat nls_cp437 16384 0 nls_iso8859_1 16384 0 tun 32768 0 vfat 20480 0