I get this error when upgrading the xgs3700-24hp firmware.Can you support the solution?
Welcome to Zyxel community.
For starters, firmware upgrading is unique in XGS3700 series, you must go one version at a time, that is, 4.10 -> 4.20 -> 4.30. So if your current version is 4.10, please upgrade it to 4.20 firstly and then 4.30.
Please also check if your .bin file is damaged or not, you may download in the link below:
Also, it's suggested that you specify the image number which you desired to upgrade.
Hopefully it helps.