Arduino mega2560 with wiznet850 ethernet module

Using Arduino Project Guidance
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I have two costume boards based on Arduino mega2560 with wiznet850 ethernet module to send UDP packet over ethernet. one of them has atmega2560 16u-TW and the other one has atmega2560 16u-TH .

I checked the hardware connection for both boards and everything is working.

the issuse is that the first board (with atmega2560 16u-TW) is just working fine, meaning it takes an ip and i can ping it from my pc locally. however; the one with (atmega2560 16u-TH)can not take an ip ( it shows me that ip is 0.0.0.0 and sometimes 255.255.255.255).

doese anyone faced the same problem on know why this happens?

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