Now that the causes are clear, here is a systematic approach to resolve the "disagreement" error, ordered from the simplest checks to the most advanced.
If everything fails, the chip is likely "dying" (charge pump failure internally) or the board circuit is interfering.
The most common cause. If the clip or socket isn't making perfect contact with every pin of the chip, one bit can flip during writing or reading. Now that the causes are clear, here is
In your programming software, always follow the correct order: Erase -> Blank Check -> Open File -> Program -> Verify . After a successful flash, it's wise to close the software, reopen it, and perform a complete chip read and save it to a new file. Comparing this to your original file is a final, robust verification.
As the days turned into weeks, the team's frustration grew. They began to question their own sanity: were they really seeing what they thought they were seeing? Was the CH341A truly developing a kind of "memory schizophrenia"? The engineers started to experience strange occurrences – equipment malfunctioning, eerie whispers in the lab, and an unsettling feeling of being watched. If the clip or socket isn't making perfect
: If you are using a clip on the motherboard and it keeps failing, you may need to desolder the chip . Other components on the board (like the SIO chip) can "steal" power or interfere with the SPI bus.
❌ SPI flash memory cannot be overwritten directly. If you do not wipe it first, the new data and the old data will clash. Comparing this to your original file is a
Use isopropyl alcohol to clean the chip legs.
Trying to flash the chip while it is still soldered to the motherboard can cause interference. Other components might be dragging the voltage down or drawing too much current. 4. Incorrect Chip Selection/Size