So I had two x20 v2 working fine. 

I used Parental Control for years and performance to allow/deny, add more minutes of screen time, etc, it started working painfully slow.

Until one day, they parental control became unusable slow.

So I set my sattelite deco as main unit, and switched them, and things went back to acceptable.

A few moths passed, and now the sattelite unit no longer connects.

Tried resetting it and re adding as satellite, but wasnt recognized. 

Pushed the reset a few more times, tried until green blinking (firmware re upload mode)... So I rolled back its firmware to the version thats available online, but still I'm not being able to add as satellite.

Also tried to set up as a new deco network, still not being recognized by the app. All devices are within 1 meter of each other. 

The device blinks blue, but it shows two DECO_xxxxx networks on the phone. Neither of those matches the value from the sticker, for example the sticker says DECO_210C but the two networks visible show something like DECO_AADB and DECO_11FB. These values keep changing after some minutes and both are generated by the faulty unit.

What should I try next?