There is a possibility that your device may be too old to support the latest firmwares starting from RUT2_R_00.07.0. As a first step, I recommend updating your RUT240 to the latest legacy firmware, which is RUT2XX_R_00.01.14.7, and see how it goes. You can download it from the same link you provided.
Additionally, please log in to your router’s SSH via CLI and execute the commandsmnf_info -sandmnf_info -m. Check the output to ensure that it shows the correct serial number (but please refrain from sharing it here, as this information is sensitive to post it on the internet). Sometimes firmware update issues can occur due to lost router parameters.
If you were able to upgrade your RUT240, it indicates that all router parameters, such as the serial number, are intact. Loss of parameters would typically display as ‘00000000000’ in WebUI and SSH, or will not display anything at all.
Regarding the product code, you’re correct; You have a RUT240 Global version standard package with a US PSU. For a detailed list of product codes and their specifications, you can refer to our website’s ‘Ordering’ section here.
Feel free to reach out if you have any further questions or require additional assistance!