ESP8266 Community Forum

- Mon Jul 06, 2015 4:31 am #22547 Hi Eyal,

My power supply can go up to 1A so that should be enough. The garbage at power on does not appear, neither do any messages like 'ready' or 'error' which I used to see before I messed it up.

It would probably a quicker (and maybe cheaper) way to "restore" the device by buying a new one but I don't want to buy a new device every time an update goes wrong. That's why I am wondering if there is another way to program the eeprom. For example by removing it and reprogram it with an external programmer. I don't have one at the moment except a Xilinx programmer which is also does some SPI stuff...

Regards,
Roland

6502 Inside

- Mon Jul 06, 2015 5:07 am #22550 I will say this anyway since it happened to me a few times.
I get no response from the esp which turns out to be TX/RX lines reversed. Worth a check?
I know, trivial thing, maybe a stupid suggestion, but what do I lose :-)

- Mon Jul 06, 2015 6:00 am #22555 Hi Eyal,

RX and TX are correctly connected, double checked it!

Before I bricked it, I connected RX and TX on the module and it starts "talking to itself": it displays the boot message and 'ready'. This is interpreted as an unknown command so there is an 'error' message. Which is a new unknown command, etc.

So connecting RX and TX on the module wil have the blue led lighten up. This does not happen at the moment.

Greetings,
Roland

6502 Inside

- Mon Jul 06, 2015 6:37 am #22557 Hey, dont't worry it's not possible to brick a esp8266 by partial firmware upload. The bootloader is not a part of the firmware that you can flash, it resides in the rom of the esp chip and thus cannot be altered.

My first guess: do you have a direct connection (jumper wire) from PL2303 GND to the GND of the esp module?