I successfully upgraded the system.
Unfortunately, I realized that there is an extreme slowness in the gameplay of Nintendo DS, preventing a good gameplay, so as feedback, I inform you that there is no good gameplay with the core of DeSmuME inserted at the moment.
In the tests I saw on Nintendo DS on Raspberry Pi 3 with Retropie, I realized that the emulation is fluid and very good, but the core used is DraStic, and what was inserted in this test Update is DeSmuME, In it, there are no emulation options like in DraStic (RetroArch options only).
The DraStic version r188.8.131.52 is used in retropie 4.1 and, once the analog is pressed right to the right, we access the configuration options like frameskip etc.
In this video, we can see that the emulation is fully fluid in Raspberry Pi3 with this version of the core of DraStic. (Https://www.youtube.com/watch?v=LQPyUUvCDq0)
So I ask: would it be possible to replace the DeSmuME Core with that of DraStic r184.108.40.206 just as it exists in the retropie?
Thanks for the info and hope you enjoy my feedback on the nintendo ds