End nodes (LHT65) at V3

Hallo i register my end node Temperature and Humidity sensor in TTS (V3) as well as the gateway.
It worked all the night well and today. once i changed the data rate with other value, i can’t see it again. i set it to old value again to see it but it is not be seen.

My end node send the data because i can access on it (with serial cable and putty). I need your help urgently please. i have attached an image to declare it
problemlht65 snipperaproblem2

Are you using OTAA or ABP?

ABP.

I have erased the end node and reregistered it and it is working now !

imho the problem was caused by fcnt-value. If you use OTAA this counter will be reset to 0. If you use ABP the counter of your node will not be reset and is less than the counter of TTN, the node will be ignored.

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Vielen Dank. Liebe Grüße aus Berlin