ZBT Z8103AX-D: upgrading from 21.02 to 23.05

[darknblack]

Here:

Sysupgrade vs factory image upgrade

You use "sysupgrade" image if you flash from a live OpenWrt system. Either sysupgrade from LuCI or using SSH console. "factory" image if you flash by using the original OEM firmware, the possibly built-in TFTP recovery interface (in some routers), or some other recovery tool from the original manufacturer. For most routers the factory image contains a header that makes it compatible (recognizable) with the OEM flashing routine: like "Factory = header + sysupgrade image + possibly padding". Bu…

Try the one that is sent by the supplier first, if it didn't work then try the factory.bin.