Weird, it worked fine before, but now it always gets stuck at SF and can't get into NSH??

Troubleshooting
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Need help @zhenpeng

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Help, help, urgent! @yxhuang

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Also, why is it that when I plug into this port and apply 5V power, our development board completely doesn’t respond? The light doesn’t light up, and measuring the 5V and GND below also shows 0 (Note: here, the black wire I connected is indeed 5V, just the wire color is mismatched). But when I plug into the C port, everything works fine, but when I give it to the computer to run NSH, it always gets stuck right after running SF, before even reaching ABCD. That didn’t happen before.

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Help help, urgent urgent urgent, !!! @zhenpeng @yxhuang

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@思澈官方 Help, help

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The voltage is too high, right? Try reducing the VBAT battery voltage to within the voltage range and test again.
LCSC·HuangshanPi Development Board User Guide | SiFli Wiki
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@诺狞猫 But, but, the battery I first connected was 3.7 volts, and it didn’t respond. Then I switched to 5 volts, but it still wouldn’t light up. It’s really weird.

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Are you measuring the voltage at this BAT test point? And also the voltage here

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Solved! I’ll post the solution later, (◍•ᴗ•◍):heart:@诺狞猫

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The specific solution for XPQH is written in my repository, you can pull it for reference: contest2026_427_xinpingqihe/docs/07_构建烧录与复现指南.md at dev-ai-contest-2026 · open-vela/contest2026_427_xinpingqihe The order cannot be reversed: The ROM first reads the ftab (FlashTable) at the starting address 0x12000000 of the flash to know where the secondary bootloader is. This area is empty from the factory — if you only flash the firmware without writing the ftab, it will just keep printing SFBL.