root@eg-15EA85:/# sysupgrade -v /tmp/openwrt-snapshot-r22032+10-f8954a56e5-sunxi
-cortexa7-etactica_egm400-squashfs-sdcard.img.gz 
Wed Feb  8 13:40:38 UTC 2023 upgrade: Image metadata not present
Wed Feb  8 13:40:38 UTC 2023 upgrade: Reading partition table from bootdisk...
zcat: write error: Broken pipe
zcat: write: Broken pipe
Wed Feb  8 13:40:39 UTC 2023 upgrade: Reading partition table from image...
Wed Feb  8 13:40:39 UTC 2023 upgrade: Saving config files...
etc/config/btagent
etc/config/dhcp
etc/config/dropbear
blah/lots/of/files
more/files/snipped
Wed Feb  8 13:40:39 UTC 2023 upgrade: Commencing upgrade. Closing all shell sessions.
Watchdog handover: fd=3
- watchdog -
Watchdog does not have CARDRESET support
Wed Feb  8 13:40:40 UTC 2023 upgrade: Sending TERM to remaining processes ...
Wed Feb  8 13:40:44 UTC 2023 upgrade: Sending KILL to remaining processes ...
[ 7012.241519] stage2 (11570): drop_caches: 3
Wed Feb  8 13:40:51 UTC 2023 upgrade: Switching to ramdisk...
Wed Feb  8 13:40:53 UTC 2023 upgrade: Performing system upgrade...
Wed Feb  8 13:40:53 UTC 2023 upgrade: Reading partition table from bootdisk...
0+1 records in
0+1 records out
zcat: write error: Broken pipe
zcat: write: Broken pipe
Wed Feb  8 13:40:53 UTC 2023 upgrade: Reading partition table from image...
1016+0 records in
1016+0 records out
zcat: write error: Broken pipe
zcat: write: Broken pipe
Writing image to /dev/mmcblk1p1...
zcat: write error: Broken pipe
zcat: write: Broken pipe
65536+0 records in
32+0 records out
Writing image to /dev/mmcblk1p2...
60414+1 records in
29+1 records out
Writing new UUID to /dev/mmcblk1...
4+0 records in
4+0 records out
zcat: write error: Broken pipe
zcat: write: Broken pipe
Wed Feb  8 13:41:00 UTC 2023 upgrade: Upgrade completed
Wed Feb  8 13:41:01 UTC 2023 upgrade: Rebooting system...
umount: can't unmount /dev: Resource busy
umount: can't unmount /tmp: Resource busy
[ 7022.300643] reboot: Restarting system

U-Boot SPL 2023.04-rc1-00204-g20b43c17a0 (Feb 06 2023 - 10:57:59 +0000)
DRAM: 512 MiB
Trying to boot from MMC2


U-Boot 2023.04-rc1-00204-g20b43c17a0 (Feb 06 2023 - 10:57:59 +0000) Allwinner Technology

CPU:   Allwinner H3 (SUN8I 1680)