Some random thoughts:
- There is a brass pin in the middle of the edge under the card that may want to “jump” and go missing, so be mindful of that (and it’s sibling that is under the modem card, if you remove the whole plastic frame)
- When removing or connecting the antenna connectors, always make sure the movement is up-down (not in an angle. That way, if the connectors line up, they will connect and if you miss, the force you apply is doing least damage, compared to any twisting or bending. And the wire connector is more likely to break, which is good, because it’s less expensive of the two - you do not want to break or remove the connector from the board. The cable can be sacrificed.
- The connectors on the new card are in different places so you need to route wire via a new path. There are a couple of methods and at least one that requires to bend the wire to a sharp angle, which I’d be careful with. Optionally you can remove some plastic to make a new pathway for the wire (but be mindful how the cover attaches).
- @ChriChri has good pics on this and there is also the L5 disassembly video
- As the cables connect in a new place, the cover does not offer any support to keep them pressed on the board anymore - you may want to add a piece of plastic or thick tape on to the underside of the cover, so that it helps secure the connectors (so they don’t easily pop out of place). There’s a small bumb there you just need to extend a bit.
- Avoid carpets and wool mittens