Clarion PU-9587A Code Issue: D17005GF 600, Resetting to 2121, Processor Block & Solutions

In the middle sits the D17005GF 600. On the site I have reset the code to 2121 (by desoldering some elements of the smd jumpers / capacitors or resistors - it worked with a similar radio only 3 years older). The radio still does not want to work. Apparently, the processor is blocked and does not want to accept the code. I have two radios with the same problem.
How to read the code - whether it is encoded in memory, or indeed in a "mechanical" manner on the board. Will I find a service manual somewhere from this model or from the processor? Maybe a memory batch?
Possibly I am looking for someone who would make repairs. I can provide additional information (if I can do it).
Greetings,
Kamil

For sure it can be done and more than one user of this forum can do it. Only that he will not do it at a distance. I think you have to look for another service at home, and someone who really knows the subject.

On this radio, this old model [was also so to SAAB], the code is actually encrypted in the diode array but for today on the forum questions about codes are not allowed:
https://www.elektroda.pl/rtvforum/forum17.html

And old equipment, well sometimes it is not known by many websites.

I think about the subject as exhausted and as being rubbing about the regulations - I'm closing.