@Vincent-TP, I didn't know there is a different version available. That's been the solution. Thank you very much!

The file-name of the firmware I wanted to upload is EAP653URv1_1.2.1_[20241126-rel71511]_up_signed.bin. I also tried to use EAP653URv1_1.0.0_[20240402-rel55106]_up_signed.bin with the same result

I just installed my first WiFi router. Next, I wanted to upgrade FirmWare, however it fails, just after uploading 2 % of the software. Message is "Failed to check for new update" Any idea what whent...