Desoldering is impossible.

It’s my 4th intent. i’ve tried everything: desoldering with wick, desoldering with heatgun, desoldering with pump, desoldering adding solder to make it easier to extract the orinal solder, small tips (that never get hot on the tip, only on the sides), angular tips, big tips, 350, 380, 400, 450, 600, 700 C, the solder never makes it to the wick or gets sucked by the pump. i’ve seen people lasting 3 seconds to put the pum on the solder and everything goes clean, Mine never last more than hal a second on liquid state even at 700 celsius. i’m done, i’m exhausted, it’s jusst impossible, i’m done