Ender 3 v2 Latest firmware constant thermal runaway?

These lines are what give us the best info:

Recv:  T:205.59 /210.00 B:60.01 /60.00 @:127 B@:24
Recv:  T:205.61 /210.00 B:60.02 /60.00 @:127 B@:18
Recv:  T:205.70 /210.00 B:60.00 /60.00 @:127 B@:25
Recv:  T:205.70 /210.00 B:60.01 /60.00 @:127 B@:22
Recv:  T:205.64 /210.00 B:59.99 /60.00 @:127 B@:30
Recv:  T:205.70 /210.00 B:59.97 /60.00 @:127 B@:38

The @:127 means that the hotend heater is on at 100% power, but the T: value shows that the temperature isn’t rising - which is not what you’d expect from 100% power.

Firstly, make sure that the silicon sock is fitted to your heatblock - like so:

Secondly, make sure the thermistor is correctly in the hole in the heatblock to make sure you’re getting proper temperature readings:

If all those are good, you should perform a PID tune as documented in the FAQ.

Running through these is likely to solve the majority of the problems that would cause this.