U1:B has a short between pins 4 & 6.

The reason you have 4 separate packages is because you have used an incorrect syntax for the prefixes. It is Um.n  where m = the package number              n = the number of the device in package m. So for example, the device you have prefixes as: U1:B should be written as: U1.2 Please take care to read the Tutorial and other documentation carefully to help yourself to avoid making mistakes. :)

@andyfierman OK. Thank you so much for spotting my mistake. So can I correct my schematics and update my PCB layout without losing my progress in the PCB Layout?

I have no idea what will happen to your PCB layout since you have not posted a link to a public copy to see it.

@andyfierman This is my PCB Layout... [https://easyeda.com/Natanaelprado/nex-discovery-board](https://easyeda.com/Natanaelprado/nex-discovery-board)  I've updated my schematics now with the correct syntax for the prefixes, the only thing I need is to update my PCB Layout footprints.

@Natanaelprado, Clone your project then try doing **Update PCB...**  on that and see what happens.

Yes, that will work OK and will not trash your PCB layout. BUT... If only people would read the documentation we provide before they launch into fantastically complex projects without having understood how to use the tool. Before you first converted your schematic to PCB you did not run, check, investigate and correct the many net errors and warning that exist. You did not terminate any unused pins with the green Unconnected Pin X symbol so they are all still confusing the Design Manager by loafing about as "net has less than two connections" warnings. Until you sort out the schematic and therefore the Design Manager warnings and get all the nets sorted (if there are 100 nets then it should show 100/100), you cannot rely on the PCB being correct to what you intend the schematic to represent. In other words you do not know if the connectivity of the schematic is complete. Then go through the checklist in (4) in (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a) Then you must do the same with the PCB Design Manager: * all the components present (the number shown in the PCB Design Manager = the number in the Schematic Design Manager)' * all the nets must show up as complete (no white cross on red background); * no DRC errors. Then go through the checklist in (6) in (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a) Then you can run the Gerbers, check them using gerbv and complete the checklist (6) above. Then check everything again. Then submit the board for manufacture after reading the instructions at the bottom left of the JLCPCB submission page.

Yes... It worked, Now the PCB Layout is updated with one unique footprint for each component. Thank you :) One more question. Do you think that my track width and clearance are ok to the manufacture? I mean JLCPCB machines can do it or it's too near to each one? including vias...

Check this page: [https://jlcpcb.com/pcbAssembly](https://jlcpcb.com/pcbAssembly)