Hi!  I setup my very first TP-Link ER605 router just over 2 months ago and so far, it's been great!  However, I can't seem to update the firmware, for the life of me.  :)   I can download the ZIP file ok.  I unzip it, go to the "Firmware Upgrade" tab in the Management area and when I try to upload the BIN file, I get an error indicating the firmware upgrade failed.

The last firmware upgrade I tried installing I found here:   https://support.omadanetworks.com/us/product/er605/v2/?resourceType=download

File:  ER605(UN)_V2_2.2.6 Build 20240718

Is version 2.1.2 the latest firmware that's actually available for the ER605 or should I be able to install the latest firmware posted on the website?   I'm using the ER605 as a standalone router in that I'm not using any of the cloud management features, etc.

Thanks in advance!