update firmware failed

DGTinfo

i have a situation like in the attached picture, i can't update the firmware of the standby partition. I tried both cloud and local solution.
I found this solution in the forum
https://community.zyxel.com/en/discussion/13011/recovery-steps-for-usg-flex-atp-series-with-device-has-firmware-update-fail/p1?new=1
but the FW present on my device does not match

Zyxel_Stanley

Hi @DGTinfo

I recommend taking a backup of your configuration. Additionally, try rebooting your device using the #1 partition (or enter following CLI command before rebooting device):

> set firmware boot number 1

Afterward, you can proceed with upgrading your device to the ZLD 5.36 Patch 2 firmware.

PeterUK

backup config download USG20-VPN 4.16 and update standby firmware

https://www.dropbox.com/s/hz53xvjat7llten/USG20-VPN_Firmware_4.16%28ABAQ.1%29C0.zip?dl=1

https://support.zyxel.eu/hc/en-us/articles/360013941859-Security-Products-Firmware-Overview-FLEX-ATP-USG-VPN-ZYWALL-

it might be best to unplug WAN and reboot

DGTinfo

https://community.zyxel.com/en/discussion/comment/52553#Comment_52553

from the 2 link i found the firmware 4.16 for the NON wireless version.
However I launch update locally, the file is loaded, then the update is not performed

PeterUK

edited the above for right link to USG20-VPN - ABAQ

They are all listed here

https://support.zyxel.eu/hc/en-us/articles/360013941859-Security-Products-Firmware-Overview-FLEX-ATP-USG-VPN-ZYWALL-

if you have usg20W-vpn you need usg20W-vpn

https://www.dropbox.com/s/ai66w7wqvo5df4j/USG20W-VPN_Firmware_4.16%28ABAR.1%29C0.zip?dl=1

DGTinfo

downloaded the correct FW, I tried to update both from the web interface with a local path and via FTP, but it doesn't work.
I also tried the procedure via USB, but in the SSH connection it returns me this error

DGTinfo

https://community.zyxel.com/en/discussion/comment/52595#Comment_52595

Hi Stanley,
thanks for the advice
At the moment I solved it like this:
configuration backup
booting the device from the outdated partition 1
upgraded partition 2
rebooting the device from partition 2
configuration restore
partition 1 upgrade

NOTE
the problem is that by restarting the device from partition 1 the credentials are not updated, luckily I was able to recover the password for this device