Mega2560 R3 upload esp8266 example with IDE.2

Development Tools IDE 1.x
1

After set up esp8266 board and port, IDE can complete compilation but cannot upload.
The error messages as below:

"C:/Users/Owner/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
Failed uploading: uploading error: exit status 1

How to solve the problem?

How to choose TX0 , RX0 or TX1 RX1, ...... when using esp8266 example sketch?

When mega2560 R3 USB power on, only RX0 is 5v, RX1,RX2, and RX3 all are
less than 1v. Is that normal?

2

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