Open your CH341A programmer. Look near the black chip. You’ll see a jumper or a tiny solder blob for "3.3V / 5V." Here’s the truth that no eBay listing tells you:
If everything fails, the chip is likely "dying" (charge pump failure internally) or the board circuit is interfering. Open your CH341A programmer
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: Flux residue or oxidation on the chip's legs can prevent a solid connection. Clean the pins with 90% or higher Isopropyl Alcohol and a soft brush. Open your CH341A programmer
: Performs a micro-burst write/read test on a single non-essential sector.
Help!chip main memory with the contents are in disagreement!