When I was modifying a GSM module, I added a functional module and the four-layer board could no longer meet the design requirements. I needed to modify it to a six-layer board. Because I still wanted to share the previous design and didn\'t want to make major changes, the two additional layers needed to be added on top according to my stacking (one layer between L2 and L3, and one layer between L3 and L4). I searched for information on this online but found none. I gave up later. I was really overwhelmed by the four-layer board, so I tried to modify it and found that it only took three steps to solve the problem. I\'ll leave this article for everyone to learn from.
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