diff --git a/tools/pyboard.py b/tools/pyboard.py
index 29af27f02ba2e..c0bb778a321ee 100755
--- a/tools/pyboard.py
+++ b/tools/pyboard.py
@@ -287,11 +287,15 @@ def __init__(
for attempt in range(wait + 1):
try:
if os.name == "nt":
- # Windows does not set DTR or RTS by default
self.serial = serial.Serial(**serial_kwargs)
- self.serial.dtr = True
- self.serial.rts = False
self.serial.port = device
+ portinfo = list(serial.tools.list_ports.grep(device)) # type: ignore
+ if portinfo and portinfo[0].manufacturer != "Microsoft":
+ # ESP8266/ESP32 boards use RTS/CTS for flashing and boot mode selection.
+ # DTR False: to avoid using the reset button will hang the MCU in bootloader mode
+ # RTS False: to prevent pulses on rts on serial.close() that would POWERON_RESET an ESPxx
+ self.serial.dtr = False # DTR False = gpio0 High = Normal boot
+ self.serial.rts = False # RTS False = EN High = MCU enabled
self.serial.open()
else:
self.serial = serial.Serial(device, **serial_kwargs)
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