****All right 
That sounds like a promising lead - if you see it in neighbours of winbox, you will see it in neighbours of routerOS (same discovery protocol) and hopefully able to connect. Once you are in, you can run
/system reset-configuration
and confirm with “Y”
Just a note on your reset procedure - you mentioned few times “3 seconds” - I would like to stress out that using exact seconds is not recommended. Observing status of USR LED is much better as it signalizes the true status of what will happen. Also, my experience says that 3 sec is not long enough. The USR LED shows approximately this:
- after powerup, it blinks once, for fraction of second
- then turns solid light for approximately 4 seconds. If you release it during this stage, it will load backup bootloader and start with existing config
- Then it starts blinking for approximately 5 seconds. If you release it during this blinking stage, it should factory reset.
- Then it turns solid light for approximately 5 seconds. If you release it during this solid light stage, it should reset config and switch into CAPS mode
- Then it turns the light off. If you release button now, it will go to netinstall mode
If you really hold for 3 seconds, you likely end up in stage “2” which just loads backup bootloader but leaves the config alone.