I have ESP-01S and it was working well. But memory size was not enough for my task. I bought W25Q32FV and replaced original 1 MB chip. After replacing I turned it on and noticed that blue LED is flashing in quite weird way, like there is bad connection. I turned it off, cleaned up remains of fluxe, turned on again - now blue LED is always on in programming mode. In normal mode it just blinks once at boot-up time and then it is off.
I can not upload any firmware on ESP-01S, because serial connection can not be established. I could not solve it and decided to install original flash chip. Result is the same: blue LED is always on in programming mode.
I was soldering in careful way, I checked that there are no short-circuits, that chip is installed according to it's key. I'm using USB programmer to flash ESP. So, I tried using different USB ports - result the same. I installed ESP into another 4-pin adapter (like this - https://www.aliexpress.com/item/4001054 ... 4c4dVbhj7c) - result the same.
Looks like ESP is damaged, but why in this case it can successfully blink 1 time by LED in normal boot mode?
Yes, I can buy new ESP but before that I would like to know is there any way to fix this ESP? Any ideas? May be I didn't consider some details? I would really appreciate any help.