How did you work out where to solder the jumpers? If you assumed the designer of this PCB was sane and sensible so the columns would be logical you may well be wrong...
Looks to me like there was/is a break on the diode connection going across the bottom that's not been fixed, and you've soldered a jumper to each dead switch where usually you only need one where the break is to fix a column.
I tried connecting the solder pads by the wire, just like on this video
list=WL&index=11&t=250s
I also tried to remove all the jumper, and none of the key is work sadly. This is my first time soldering and unsoldering a keyboard btw.
are those bare wire? or are they shielded?
there's a bunch of points near the arrow keys/nav keys that could short out
Those are bare wire, i also think that's the problem but after removing all the jumper everything still not working.