Chip Main Memory With The Contents Are In Disagreement Ch341a Top May 2026

NeoProgrammer, AsProgrammer, and the old CH341A software handle timing differently. An incorrect SPI speed can cause "disagreement" because the chip misinterprets commands.

Note: Some older software versions do not automatically unprotect the chip before writing. Try updating to a newer version of the CH341A software (v1.29, v1.30, or "NeoProgrammer" are popular choices).

If Step 1 fails, you must fix the voltage. Do not skip this.

What you need: A soldering iron, a multimeter, and a 3.3V voltage regulator (AMS1117-3.3). Note: Some older software versions do not automatically

The Mod:

After the mod: Your CH341A now speaks proper 3.3V logic. 90% of "main memory disagreement" errors vanish instantly.

Symptom: LG 24MB35 monitor wouldn't turn on. CH341A read the Top 2564 BIOS, but verification failed at address 0x0003FF every time. Error: "Main memory with the contents are in disagreement." If Step 1 fails, you must fix the voltage

Failed attempts:

The fix that worked:

Lesson: The Top chip needed both the pull-up and the slower clock. Without the pull-up, no speed reduction helped. LG monitor mainboards

"Top" chips (often found on router PCBs, LG monitor mainboards, or older laptop BIOS) are notoriously sensitive. They have:

When combined with the CH341A’s fast default clock speed, these chips return garbage data during verification.