Customised board using ESP8266 Serial port error

[viknesh_V]

@anon35827816 Thank you for your kind words. Yes we will next time use the space to include reset switch.

[viknesh_V]

@Deva_Rishi We have removed and replaced ESP8266EX but still we are getting same error

Executable segment sizes:
ICACHE : 32768 - flash instruction cache
IROM : 231500 - code in flash (default or ICACHE_FLASH_ATTR)
IRAM : 26217 / 32768 - code in IRAM (IRAM_ATTR, ISRs...)
DATA : 1496 ) - initialized variables (global, static) in RAM/HEAP
RODATA : 876 ) / 81920 - constants (global, static) in RAM/HEAP
BSS : 25520 ) - zeroed variables (global, static) in RAM/HEAP
Sketch uses 260089 bytes (27%) of program storage space. Maximum is 958448 bytes.
Global variables use 27892 bytes (34%) of dynamic memory, leaving 54028 bytes for local variables. Maximum is 81920 bytes.
esptool.py v3.0
Serial port COM12
Connecting......................................_____
Traceback (most recent call last):
File "C:\Users\Threedotsinnovations\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2/tools/upload.py", line 66, in
esptool.main(cmdline)
File "C:/Users/Threedotsinnovations/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 3552, in main
esp.connect(args.before, args.connect_attempts)
File "C:/Users/Threedotsinnovations/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/3.0.2/tools/esptool\esptool.py", line 529, in connect
raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error))
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header

We have checked voltages to the ESP8266EX, Memory IC W25Q128JVSIQ and oscillator output, everything is okay.

This is our Arduino IDE setting.

This is our port setting

We have also changed differnt baud rate and tried but still same error.

We have also tured off the save power option for this port in device manager.

[Deva_Rishi]

Then i don't know. You have done everything the way i would do it, and i am out of suggestions.

[viknesh_V]

Thank You @Deva_Rishi for your great support . After I found the root cause,I will post here .

[ZX80]

There are useful things for you in this video.
https://www.youtube.com/watch?v=_iX67plFeLs