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Unable to flach 4Ch R2 V1.0 -- NOT PRO --

Hello all, i'm trying to enter in flash mode with my sonoff 4ch R2 V1.0 not the pro, 

I have everything checked:
Cross the rx & tx and not cross
I check the voltage of my 3.3 volt and it is good.
I check the com ports, try several speeds.
My usb uses the prolific driver.

Nothing is done, no way to flash it.

I had no problem to flash my other sonoff.


Any idea about this ?

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