Recently, ESPhome added support for BK7238 chips and I tried to flash the chip. The firmware failed and now with the native VK7238 firmware using BK7231GUIFlashTool, a message appears: 0x00...CheckRespond_FlashWrite4K: bad value returned? 0x1000... Writing sector 0x1000 failed! Writing file data...

kinda feels familiar this and I think the fix was using BKFIL to erase first. Give it a try? maybe do a read of the whole chip first - does it succeed?

I closed CEN several times during booting, and everything worked out the third time. I used to turn off the power.

[Solved] [BK7238] How to fix FlashWrite4K bad value and sector 0x1000 failed?

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Need exact flashing steps and board markings
#1 21924360 19 Jun 2026 15:35

sega66 sega66

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Posts: 2
Topic author

Need exact flashing steps and board markings
Post #1 21924360 19 Jun 2026 15:35

Recently, ESPhome added support for BK7238 chips and I tried to flash the chip. The firmware failed and now with the native VK7238 firmware using BK7231GUIFlashTool, a message appears:
0x00...CheckRespond_FlashWrite4K: bad value returned?
0x1000... Writing sector 0x1000 failed!
Writing file data to chip failed.
Can this be fixed?
What is the exact device brand/model and the exact chip/module marking on the board? Is it definitely BK7238 and not BK7231N/T or another variant?
BK7238
What exact flashing steps/settings did you use: BK7231GUIFlashTool version, firmware file/source, baud rate, UART adapter voltage, wiring, power supply method, and whether you made a full flash backup before flashing?
Everything is standard, I've flashed it many times already.
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#2 21924541 19 Jun 2026 22:50

divadiow divadiow

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Post #2
21924541 19 Jun 2026 22:50

kinda feels familiar this and I think the fix was using BKFIL to erase first. Give it a try?

https://dl.bekencorp.com/tools/bkfil/v4

maybe do a read of the whole chip first - does it succeed?
#3 21924946 20 Jun 2026 19:27

sega66 sega66

Level 2

Posts: 2
Topic author Helpful post? (0)

Post #3
21924946 20 Jun 2026 19:27

I closed CEN several times during booting, and everything worked out the third time. I used to turn off the power.
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[Solved] [BK7238] How to fix FlashWrite4K bad value and sector 0x1000 failed?

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