TL-MR6400 V5.3 – Return to original installed firmware.

Hello,
I have stupidly updated the stock firmware of my TL-MR6400 V5.3 to the one I found in https://www.tp-link.com/uk/support/download/tl-mr6400/v5.3/#Firmware (UK FIRMWARE - TL-MR6400(APAC)_V5.3_220506), which is not my region… ☹. I bought my router from Greece, but it seems to be originated from Germany. After updating, the router's web interface does present an error while searching for bands, networks as well as, while switching network mode to 4G only (please see attached images). Is there a way, based on the attached S/N or P/N (please see attached image), to point me to the originally installed firmware, which was working as expected.
Best regards,
Pantelis
S/N:
4G_ONLY_ERROR:
BAND_SEARCH_ERROR:
NETWORK_SEARCH_ERROR:
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@Sunshine Sorry. Can i get firmware for mr6400 v5.30 (apac) version?
I got mistake to upgrade firmware to (eu) version.
Now my mr6400 get error like the thread starter.
When i change page in web "error code: 1"
Thanks for help
[edited]
i just get firmware from https://www.tp-link.com/id/support/download/tl-mr6400/#Firmware
my mistake not check in sticker region.
my regional indonesia
now current firmware:
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