Unresponsive RM520N-GL modem in X3000

[will.qiu]

We don’t have a specific guide for this, so you may want to refer to steps shared by other users:

Spitz X-3000: Can I replace the X62 modem with an X65?

Yeah, it’s a little fiddly but not too difficult. Here’s what I did (after running the AT commands from a PC to configure the modem): Remove the 4 rubber stoppers in the screw wells on the bottom and loosen the screws. Use a spudger or flathead screwdriver to unclip the bottom from the case and remove it. Take out the 2 screws holding the mainboard into the case. Remove the short black antenna wire from the mainboard that’s attached to the little antenna strip inside the case. Grab the heatsin…