Image Check Failed

Have been using BT Home Hub 5A as a range extender on Openwrt 21.02.3 for a while and decided to update it to the latest version 22.03.2. I have saved a copy of the current config. However when I try to flash the new image I get this error.:-

"Image check failed:

Wed Nov 30 21:40:39 UTC 2022 upgrade: The device is supported, but the config is incompatible to the new image (1.0->1.1). Please upgrade without keeping config (sysupgrade -n). Wed Nov 30 21:40:39 UTC 2022 upgrade: Config cannot be migrated from swconfig to DSA Image check failed."

I have updated twice before without a problem! If I go ahead with the update does it mean I will loose the configuration which took some time to get working?

You have interpreted


Reasons are given in the error message.

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Yes, you cannot 1:1 migrate config. I think you have lantiq chip architecture.
lantiq devices got moved to DSA in v22.

The move to the DSA switch driver is a breaking change.
OpenWrt 22.03.0 first stable release -> More targets converted to DSA

You can do a manual config backup via Luci / System / Backup. Output is zipped readable config files.
You can open the created files in a text editor and use the content as hints to manually redo the config afterwards (but do not import the config set as is, as at least network config file has incompatible parameters). The switch ports wont work, if you do.

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Thanks to both of you for confirming my suspicions!! I will not try to upgrade to latest OpenWrt as it still works OK!!
I do have a second identical router still with original software. If I feel the need to for the latest OpenWrt version I will do a clean install on that one. The problem will be trying to remember which set of instructions I used as it didn't work first time!!

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