Abov A31G213CLN - Set up the Starter Kit and Shield Board; Set Jumpers to Control the Starter Kit; Figure 9. Starter Kit Jumper and Switch

A31G213CLN Shield Board Quick Start Guide 3. Building and running project (Shield Board)
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3.2 Set up the Starter Kit and Shield Board
3.2.1 Set jumpers to control the Starter Kit
1. The Starter Kit uses USB power-①
A. Choose 3.3V and 5.0V (check the maximum operation voltage by referring to the
specification sheet).
2. External Power-②
3. Boot mode selection-③
A. Open : User Program operation mode(As a default mode)
B. Short : Boot operation mode(Debugger always enabled)
4. MCU RXD0  PC TXD Connection-④
5. LED Control (PE0~PE5) -⑤
6. Reset(S1), GPIO Input(PF6) -⑥
Figure 9. Starter Kit Jumper and Switch