Sony error E:91:01) how fix this error?

No, my case. I had done but it still show ssme error.

Error E:91:01 frequently appears on Sony cameras, signaling an issue with the flash electronics—often triggered by impact damage or by discharging the flash capacitor during camera disassembly. But Sony offers no user-friendly solution: instead of allowing users to reset the registers after repairs, like replacing the flash electronics or capacitor, they present an error code that can only be cleared with a specialized "Sony Flash Tool," which is notoriously unavailable for download. Rather than including a simple reset option in the camera’s menu, Sony forces users to rely on this inaccessible tool that’s essentially reserved for their “Sony slaves.”

As a result, countless users find themselves with a functional camera but a disabled flash. Certified Sony repair services charge up to €300 for resetting the register—a process that takes merely 1–2 minutes. This policy not only frustrates users but also obstructs independent repair technicians, who are forced to leave many customers without a viable solution.