Unable to flash Olimex ESP32-POE-ISO-EA-IND boards

[yousaf465]

recently I bought some ESP32-POE-ISO-EA-IND boards for use as a proxy from olimex website, but I am unable to flash those using

https://esphome.github.io/bluetooth-proxies/

or

https://web.esphome.io/


this is the error as shown in the web.esphome.io log

```
rst:0x10 (RTCWDT_RTC_RESET),boot:0x1b (SPI_FAST_FLASH_BOOT)
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
ets Jul 29 2019 12:21:46
```

[LubOlimex]

There seems to be some bug in ESPHome configs, refer to this thread:

https://www.olimex.com/forum/index.php?topic=9255.msg38402#msg38402

[yousaf465]

what are other methods to flash beside esphome for proxy? 
Out of 6 boards, only one was flashed successfully. what kind of issue this might be?

[LubOlimex]

Consider that each ESP32 boards that Olimex manufactures is programmed under Linux via esptool and tested here after manufacturing. Every single board gets programmed via esptool. If 5 out of 6 boards fail to program via another tools I'd suggest the issue is with the tool or the drivers, not the boards.