Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By joostn
#9970 I had a similar problem which was caused by a too weak pull up resistor on CH_PD. I don't remember which resistance I used but it seems to be critical. I'd just try shorting it directly to VCC.
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By ToSa
#14315 A newly ordered batch arrived and is working fine. They actually even look slightly different (real pinholes whereas the first batch had some kind of rectangular open slits only. As I didn't change anything and the new ones work, I suspect that the first batch is somehow damaged or not build against the same specs and therefore causing the issues.