My Omnia also got rebooted during the update. These are the last log lines it transmitted over ssh (I was connected via Ethernet, so wifi restart should not affect it).
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-base
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/network reload dependency on /etc/config/dhcp
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/network reload dependency on /etc/config/radvd
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/wireless reload dependency on /etc/config/network
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/firewall reload dependency on /etc/config/luci-splash
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/firewall reload dependency on /etc/config/qos
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/firewall reload dependency on /etc/config/miniupnpd
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/firewall reload dependency on /etc/config/sqm
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/dhcp reload dependency on /etc/config/odhcpd
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/fstab reload trigger for non-procd /etc/init.d/fstab
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/system reload trigger for non-procd /etc/init.d/led
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/system reload dependency on /etc/config/luci_statistics
2021-02-26 03:41:03 notice ucitrack[]: Setting up /etc/config/bcp38 reload dependency on /etc/config/firewall
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-mod-network
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-mod-system
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-mod-status
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-mod-admin-full
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of libedit
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-compat
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-app-hd-idle
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-app-samba4
2021-02-26 03:41:03 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-app-minidlna
2021-02-26 03:41:04 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-lib-ipkg
2021-02-26 03:41:04 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-app-transmission
2021-02-26 03:41:04 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-app-ahcp
2021-02-26 03:41:04 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-app-bcp38
2021-02-26 03:41:04 err hostapd[]: Failed to set beacon parameters
2021-02-26 03:41:04 err hostapd[32082]: Last message 'Failed to set beacon' repeated 1 times, suppressed by syslog-ng on turris
2021-02-26 03:41:04 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-proto-relay
2021-02-26 03:41:04 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of luci-app-lxc
2021-02-26 03:41:04 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of base-files
2021-02-26 03:41:04 err hostapd[]: Failed to set beacon parameters
2021-02-26 03:41:06 err hostapd[32082]: Last message 'Failed to set beacon' repeated 1 times, suppressed by syslog-ng on turris
2021-02-26 03:41:06 notice sysfixtime[]: saved 'Fri Feb 26 03:41:06 CET 2021' to /dev/rtc0
2021-02-26 03:41:06 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of knot-libzscanner
2021-02-26 03:41:06 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of knot-libs
2021-02-26 03:41:06 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of knot-resolver
2021-02-26 03:41:06 info dnsmasq[13609]: exiting on receipt of SIGTERM
2021-02-26 03:41:06 notice dnsmasq[]: DNS rebinding protection is active, will discard upstream RFC1918 responses!
2021-02-26 03:41:06 notice dnsmasq[]: Allowing 127.0.0.0/8 responses
2021-02-26 03:41:09 info dnsmasq[28005]: started, version 2.80 DNS disabled
2021-02-26 03:41:09 info dnsmasq[28005]: compile time options: IPv6 GNU-getopt no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth nettlehash DNSSEC no-ID loop-detect inotify dumpfile
2021-02-26 03:41:09 info dnsmasq-dhcp[28005]: DHCP, IP range 192.168.18.10 -- 192.168.18.254, lease time 12h
2021-02-26 03:41:09 info dnsmasq-tftp[28005]: TFTP root is /srv/tftp
2021-02-26 03:41:09 info dnsmasq-dhcp[28005]: read /etc/ethers - 0 addresses
2021-02-26 03:41:09 info /dhcp_host_domain_ng.py[]: DHCPv4 new lease
2021-02-26 03:41:09 warning /dhcp_host_domain_ng.py[]: DHCP unknown operation [old,bigclown,192.168.18.115]
2021-02-26 03:41:09 info /dhcp_host_domain_ng.py[]: Refresh kresd leases
2021-02-26 03:41:10 info /dhcp_host_domain_ng.py[]: DHCP update hostname [bigclown,192.168.18.115]
2021-02-26 03:41:10 err hostapd[]: Failed to set beacon parameters
2021-02-26 03:41:10 err hostapd[32082]: Last message 'Failed to set beacon' repeated 1 times, suppressed by syslog-ng on turris
2021-02-26 03:41:10 info /dhcp_host_domain_ng.py[]: Refresh kresd leases
2021-02-26 03:41:10 err hostapd[]: Failed to set beacon parameters
2021-02-26 03:41:10 err hostapd[32082]: Last message 'Failed to set beacon' repeated 1 times, suppressed by syslog-ng on turris
2021-02-26 03:41:10 info /dhcp_host_domain_ng.py[]: DHCPv4 new lease
2021-02-26 03:41:10 warning /dhcp_host_domain_ng.py[]: DHCP unknown operation [old,bigclown,192.168.18.115]
2021-02-26 03:41:10 info /dhcp_host_domain_ng.py[]: Refresh kresd leases
2021-02-26 03:41:11 info kernel[]: [698252.126112] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
2021-02-26 03:41:11 notice hostapd[]: wlan1: INTERFACE-ENABLED
2021-02-26 03:41:11 err hostapd[]: Configuration file: /var/run/hostapd-phy1.conf
2021-02-26 03:41:11 err hostapd[]: Configuration file: /var/run/hostapd-phy0.conf
2021-02-26 03:41:12 info /dhcp_host_domain_ng.py[]: DHCP update hostname [bigclown,192.168.18.115]
2021-02-26 03:41:12 err /dhcp_host_domain_ng.py[]: Kresd is probably not running no socket found.
2021-02-26 03:41:12 info kresd[28370]: [system] warning: hard limit for number of file-descriptors is only 4096 but recommended value is 524288
2021-02-26 03:41:12 info kresd[28370]: [ta_update] refreshing TA for .
2021-02-26 03:41:12 info kresd[28370]: [ta_update] next refresh for . in 23.765694444444 hours
2021-02-26 03:41:12 info /dhcp_host_domain_ng.py[]: DHCP update hostname [bigclown,192.168.18.115]
2021-02-26 03:41:12 info /dhcp_host_domain_ng.py[]: Refresh kresd leases
2021-02-26 03:41:13 warning kernel[]: [698254.059744] ath10k_pci 0000:02:00.0: pdev param 0 not supported by firmware
2021-02-26 03:41:13 info kernel[]: [698254.081513] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
2021-02-26 03:41:13 notice hostapd[]: wlan0: INTERFACE-ENABLED
2021-02-26 03:41:13 err hostapd[]: Failed to set beacon parameters
2021-02-26 03:41:13 err hostapd[32082]: Last message 'Failed to set beacon' repeated 1 times, suppressed by syslog-ng on turris
2021-02-26 03:41:13 notice hostapd[]: wlan1: INTERFACE-DISABLED
2021-02-26 03:41:13 notice hostapd[]: wlan0: INTERFACE-DISABLED
2021-02-26 03:41:13 err hostapd[]: nl80211: Could not configure driver mode
2021-02-26 03:41:13 notice hostapd[]: nl80211: deinit ifname=wlan1 disabled_11b_rates=0
2021-02-26 03:41:13 err hostapd[]: nl80211 driver initialization failed.
2021-02-26 03:41:13 notice hostapd[]: wlan1: interface state UNINITIALIZED->DISABLED
2021-02-26 03:41:13 notice hostapd[]: guest_turris_1: AP-DISABLED
2021-02-26 03:41:13 notice hostapd[]: guest_turris_1: CTRL-EVENT-TERMINATING
2021-02-26 03:41:13 err hostapd[]: hostapd_free_hapd_data: Interface guest_turris_1 wasn't started
2021-02-26 03:41:13 notice hostapd[]: wlan1: AP-DISABLED
2021-02-26 03:41:13 notice hostapd[]: wlan1: CTRL-EVENT-TERMINATING
2021-02-26 03:41:13 err hostapd[]: hostapd_free_hapd_data: Interface wlan1 wasn't started
2021-02-26 03:41:13 err hostapd[]: nl80211: Could not configure driver mode
2021-02-26 03:41:13 notice hostapd[]: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
2021-02-26 03:41:13 err hostapd[]: nl80211 driver initialization failed.
2021-02-26 03:41:13 notice hostapd[]: wlan0: interface state UNINITIALIZED->DISABLED
2021-02-26 03:41:13 notice hostapd[]: guest_turris_0: AP-DISABLED
2021-02-26 03:41:13 notice hostapd[]: guest_turris_0: CTRL-EVENT-TERMINATING
2021-02-26 03:41:13 err hostapd[]: hostapd_free_hapd_data: Interface guest_turris_0 wasn't started
2021-02-26 03:41:13 notice hostapd[]: wlan0: AP-DISABLED
2021-02-26 03:41:13 notice hostapd[]: wlan0: CTRL-EVENT-TERMINATING
2021-02-26 03:41:13 err hostapd[]: hostapd_free_hapd_data: Interface wlan0 wasn't started
2021-02-26 03:41:13 notice netifd[]: radio1 (28045): WARNING (wireless_add_process): executable path /usr/sbin/wpad does not match process 14198 path (/proc/14198/exe)
2021-02-26 03:41:13 notice netifd[]: radio0 (28040): WARNING (wireless_add_process): executable path /usr/sbin/wpad does not match process 21577 path (/proc/21577/exe)
2021-02-26 03:41:13 notice netifd[]: radio0 (28040): Device setup failed: HOSTAPD_START_FAILED
2021-02-26 03:41:13 notice netifd[]: radio1 (28045): Device setup failed: HOSTAPD_START_FAILED
2021-02-26 03:41:13 info /dhcp_host_domain_ng.py[]: DHCPv4 new lease
2021-02-26 03:41:13 warning /dhcp_host_domain_ng.py[]: DHCP unknown operation [old,xbian4,192.168.18.136]
2021-02-26 03:41:13 info /dhcp_host_domain_ng.py[]: Refresh kresd leases
2021-02-26 03:41:14 info /dhcp_host_domain_ng.py[32082]: Last message 'Refresh kresd leases' repeated 1 times, suppressed by syslog-ng on turris
2021-02-26 03:41:14 info /dhcp_host_domain_ng.py[]: DHCP update hostname [xbian4,192.168.18.136]
2021-02-26 03:41:14 info /dhcp_host_domain_ng.py[]: Refresh kresd leases
2021-02-26 03:41:15 info /dhcp_host_domain_ng.py[]: DHCPv4 new lease
2021-02-26 03:41:15 warning /dhcp_host_domain_ng.py[]: DHCP unknown operation [old,Peciho-TV,192.168.18.3]
2021-02-26 03:41:15 info /dhcp_host_domain_ng.py[]: Refresh kresd leases
2021-02-26 03:41:15 info /dhcp_host_domain_ng.py[]: DHCP update hostname [Peciho-TV,192.168.18.3]
2021-02-26 03:41:15 info /dhcp_host_domain_ng.py[]: Refresh kresd leases
2021-02-26 03:41:15 info /dhcp_host_domain_ng.py[]: DHCPv4 new lease
2021-02-26 03:41:15 warning /dhcp_host_domain_ng.py[]: DHCP unknown operation [old,Peciho-probook,192.168.18.2]
2021-02-26 03:41:15 info /dhcp_host_domain_ng.py[]: Refresh kresd leases
2021-02-26 03:41:15 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of hostapd-common
2021-02-26 03:41:15 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of bind-libs
2021-02-26 03:41:15 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of bind-client
2021-02-26 03:41:15 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of bind-dig
2021-02-26 03:41:16 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of turris-version
2021-02-26 03:41:16 info updater[24146]: src/lib/logging.c:201 (log_subproc_open): Running postinst of wpad
2021-02-26 03:41:16 info /dhcp_host_domain_ng.py[]: DHCP update hostname [Peciho-probook,192.168.18.2]
2021-02-26 03:41:16 info /dhcp_host_domain_ng.py[]: Refresh kresd leases