After some searching and reading I bought a heat gun to repair the damage I did to the modem of my #Librem5 when I changed its broken middle frame.

First tries tonight went well I think. I removed and re-soldered one of the antenna sockets of my unused redpine wifi/bt card for practicing.

First picture shows the socket removed and soldered to the pcb again without removing any solder or adding new one.

The second picture shows the socket after de-soldering the socket a second time, cleaning the pcb with some de-soldering braid applying some soldering paste and soldering it back on.

Thanks @z3r0fox@mastodon.social for the hot tip !