Tp 3420 with different region setting

I try to flash openwrt to a new tp 3420 v5 - it seems there is a problem with the region settings - my system was bought in Africa. the available openwrt version is rejected by the stock update function in web ui. How can I find an openwrt version which runs on my region setting?

Please provide more information. Including the image you attempted to use.

I believe the "tftp" in the install image name would imply that the tftp method is necessary for this device.

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i used this one:

which has in fact the tftp in the name - is there any other source for installation method vioa the gui?

On newer models TP Link has been signing their firmware. Flashing via the GUI requires a correct signature thus it will not be possible to install a third party firmware through the GUI.