Hello,
I have written this exact post on the cleanflight flashing tutorial on Oscars blog but I thought posting it here might be easier.

I have been expericencing some troubles trying to flash my DYS SN20A ESC's with the latest firmware. From factory they come shipped with BLHeli 14.0 so naturally i wanted to update them to 14.4. I am using cleanflight to do so and i have gotten the ESC's to connect. I could read the settings and see that they were all on 14.0 and i could also see that one ESC was out of sync. As soon as i try to use the flash firmware feature I am met with an error. "Error writing to the flash", when clicking OK you get "Failed to write to Flash! ("Write failed" error)" and then finally "ESC#3: Flash FAILED. DYS_SN20A (Multi) BLHeli Rev: 14.4.
And now when you check the ESC status it says **FLASH*FAILED** instead of the version as if the current firmware now has been corrupted. To me it seems like quite an odd problem in that i can read the chip but not write to it. I was hoping that you or someone else could maybe help me out.


Im looking forward to reading the answers.
Thanks in advance.
- Oliver

I remember one of my friends had this problem after a hard crash, the ESC works, but no longer able to be flashed...
sorry it's just one of those weird problems I don't have an answer myself...

Yeah I thought so too... Thanks for the response though =D

damn happend to me today ... so no solution

o and i didnot even crash hard i was flying and suddenly drop out the sky...

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I was trying to flash 14.4 again after i tried 14.5 also no luch and same error flash failed but after selecting firmwas 14.3 it was flashing succesfully.

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and now its flashing the latest 14.5

(08-May-2016, 08:26 AM)Sven Wrote: damn happend to me today ... so no solution

o and i didnot even crash hard i was flying and suddenly drop out the sky...

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I  was trying to flash 14.4 again after i tried 14.5 also no  luch and same error flash failed but after selecting firmwas 14.3 it was flashing succesfully.

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and now its flashing the latest 14.5

hi sven did you figure out your problem ? i had same issue with non used little bee 20a escs. i can get in to blheli ( cc3d with fdti pass through ) but i can't flash little bees

Did you try using an arduino board instead of the passthrough? I had a flashing error before and in order for me to flash it properly, I had to use arduino. Once it was flashed then I was able to freely use passthrough.

(29-Jun-2016, 07:57 PM)trojanGoat Wrote: Did you try using an arduino board instead of the passthrough?  I had a flashing error before and in order for me to flash it properly, I had to use arduino.  Once it was flashed then I was able to freely use passthrough.

I figured out with naze32 rev5 pass through. Thank you

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Little bee 20a esc not flashable with arduino nano v3