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→40pin's UART test.
<span id="pins-uart-test."></span>
=== 40pin's UART test. ===
# As can be seen from the table below, the UART available for Orange Pi 3B is UART3, UART7 and UART9. There are three sets of UART bus
<span id="hardware-watch-the-door-dog-test"></span>
== Hardware watch the door dog test ==
