@fcanavarro76 start with the second one. You can simply use something like a scalpel or similar instrument and remove the solder mask of the trace pointed to by the red arrow. Just be careful that you do not cut through the copper underneath since you will need that to solder to :-)
Next, use a thin piece of wire and solder that on that trace and the other end to the contact that would connect to that missing solder pads. We can't see under the flex cable to see if that trace may end up in an area, that may give you more "meat" to solder to. Rebuilding solder pads will take practice so does soldering jumpers to traces. If unsure, practice on some old boards first.
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