Orbi RBS50

A bit more detail would be helpful.

The "reset button" in these instructions refer to a button on the printed circuit board inside the case that can be reached through that tiny hole in the case labelled "Reset".

https://kb.netgear.com/31486/How-do-I-reset-my-Orbi-system-to-factory-default-settings 

Sometimes it is difficult to hear (or feel) an indication that the button was actually pressed.  It often takes 10-15 seconds for the power LED to begin to flash.

When this recommended method fails, there are reports of people performing what is called a "30-30-30" reset.  i.e.

• Hold the reset button for 30 seconds.
• While still holding the reset button, remove power from the device and wait 30 more seconds.
• While still holding the reset button, apply power to the device.

90 seconds is a long time to hold that invisible button.  At least the RBW50 has a physical Power Switch.  Newer Orbi units have no Power Switch and the only way to remove/return power is to (a) unplug/replug the power cable, (b) unplug/replug the power supply from the electrical supply, or (c) connect the power supply to a physical switch.