More info about 4503 code:
Here and there I see questions regarding installation of OpenWrt on TP-Link devices and error codes 4503 + 18005.
I have been searching the forum and collected the following information, in order to improve the OpenWrt FAQ. Can someone please verify for correctness?
Issue: Error codes while trying to flash an image via TP-Link OEM WebGUI
Error code: 4503 The uploaded file was not accepted
Error code: 18005 Upgrade unsuccessfully because the version of the upgraded file was incorrect. Please…
I also found this thread. It is of another device, but it is useful to know where to find regional code in factory.bin. We only need to know the exact position inside mr200 stock bin, to compare values.
First i check BR version of stock image.
Firmware header have diffrent value of region code:
BR:
[image]
EU have 4555, US have 5553
I use hex editor to change this value in factory-eu.bin form 4555 to 4252 and use mktplinkfw tool from firmware-utils to check MD5 sum and again correct MD5 in hex editor.
Maybe someone add BR region code to mktplinkfw tool.
Good luck.