I have some more info on the bug. It appears that in current designs, the schematic symbol id and the PCB footprint id are the same. In the earlier design I am trying to update, they are different. The schematic seems to have a long id like the new versions, e.g. gge0b466d7a0d9696a1, but the PCB still has a short one, e.g. gge911. The crossprobe tool locates the PCB component just fine, so I presume it uses the RefDes and not the id. So what can I do to resolve the problem? I really don't want to have to reposition all the PCB components again.

Via： Design - Reset Component ID if schematic has subpart, you need to change the PCB footprint prefix to U1.2 or U1.1 etc and the reset the component ID

@lynxlabeling, @UserSupport, I do not find this to be an easy fix to understand or to implement so I have tried to write a procedure for it as part of this Bug Report: [https://easyeda.com/forum/topic/Reset-Component-ID-fails-on-Schematics-with-subparts-539d9f5bac554b3388c255183650498e](https://easyeda.com/forum/topic/Reset-Component-ID-fails-on-Schematics-with-subparts-539d9f5bac554b3388c255183650498e)<br> <br>

I did not know about the Reset Component ID command. I do not have any subparts, so the procedure was straightforward enough. Here is what I did: In the schematic with nothing selected, I executed the Reset Component ID command, then saved the file. Next, in the PCB with nothing selected, I repeated the command, and then updated the PCB from the schematic. Everything worked perfectly. I couldn't find documentation for this feature, so you may want to consider adding some. Also, it was not clear if it worked on only selected components or all of them. In the steps I took, it seemed to work on the entire file which is fine. In any event, documentation on the different modes of operation will be helpful.

@lynxlabeling, @UserSupport, The basic Reset Component ID procedure is documented here: [https://easyeda.com/forum/topic/How-to-solve-PCB-components-removed-and-added-after-Import-Changes-or-Update-PCB-9dbbeabbfdfa401986fa1d03b2316245](https://easyeda.com/forum/topic/How-to-solve-PCB-components-removed-and-added-after-Import-Changes-or-Update-PCB-9dbbeabbfdfa401986fa1d03b2316245)<br> <br> If you do not have any sub-parts then the process of doing Reset Component ID in both the schematic and the PCB before doing Update PCB... or Import Changes... works well and is very easy to do. The problem is that if you have sub-parts then it gets very messy.