Sorry for simple language, but i copy/paste this text from FB, I'm so lazy to write it again
I know that almost all of you know details of this kind of job.We take's also action on data recovery for hopeless cases. Recently we received damaged pendrive. Once connected - it did not show any signs of life. We decided to took pendrive apart. It turned out that we have monolith device - integrated controller system and memory module in one piece. In this case pinout must be developed. It means that we need to connect 16 small wires with corresponding points on the device. Usually, we have around 25-35 points on device. Of course, it can't be done randomly but we need to work according to the communication protocol to make it possible to read information directly from memory module.
We do it on regular basis. But the main problem is what to do when on the device surface we do not have enough connections? Light solution - you can buy X-ray machine with hight resolution (about 0.5 MLN $), x-ray device and find connection points. Hard solution - with deduction approach, experience do the same job. If on the pendrive surface you can't find sufficient number of the connections, sometimes we must go deeper: 2nd layer and deeper: 3rd layer…. and deeper: 4th layer. Only at the 4th layer we found missing connections to the memory module. You can view it on the attached picture (currently we have multilayer electronic PCBs, 8th layer and more). While working with such a device you need to be very carefully and try not to damage remaining connections because data will be lost.
All the work was done exemplary, the memory module was read and all data recovered
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