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101	101	* Connect the device to PC via UART interface.
102	102	* Make sure power off or update the firmware back to original firmware , because the LA66 USB OTA fimware is not low power consumption firmware. it will consume the battery very fast.
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104		-
105	105	== 4.2 Where to find OTA Password? ==
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107	107	Each device has a shipped label with OTA Password which is 16 chars. like below. If user don't find this, please send us a photo for the device with Dev EUI to [[support@dragino.com>>mailto:support@dragino.com]] . and we will search the password for you.
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109	109	[[image:image-20230519102907-2.png||height="286" width="580"]]
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111	111
	111	+== 4.3 How about if i upgrade a crashed firmware via OTA update? ==
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	113	+OTA update is done via Bootloader and only change the firmware partition. So update a crash firmware via OTA update won't destroy bootloader and user can use OTA method to update again. Here are notice:
	114	+
	115	+1. OTA update frequency depend on the firmware frequency. If there is no frequency in the firmware. Bootloader will use EU868 as default frequency.
	116	+1. OTA update require a reset or reactivate action. If the crash firmware doesn't have them work, user need to manuall push the physic reset button on the PCB or power off/on device.
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	118	+
	119	+
113	113	= 5. OTA Tool Known Bug: =
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