#PC won't recognise FC in DFU mode.

1 messages · Page 1 of 1 (latest)

sudden cape
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Without pressing the DFU button, the FC dosen't even show up in device manager.
Have any of you guys encountered this issue before?

I have already tried different PCs, different USB cables.

FC: GEPRC_F722_AIO
BF_ver: 10.9.0

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hollow cave
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Have you tried the Impulse RC Driver Fixer?

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https://impulserc.com/pages/downloads - download the "Driver FIxer".

ImpulseRC
Downloads

Essential utilities, firmware and models for use with ImpulseRC products. ImpulseOSD software, ImpulseRC Driver Fixer, Video transmitter firmware (AU and International Versions) and other useful links and utilities.

sudden cape
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Yes I've tried it, ImpulseDriver can't find my FC.

hollow cave
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Have you tried Zadig also?

sudden cape
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Yeap. Can't identify it.

hollow cave
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So, when you plug the FC in, does the computer make any noise?

sudden cape
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In DFU mode it does, without pressing down the boot button nothing.

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Any idea what it could be?

hollow cave
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Well, this is gonna sound really dumb, but the last time I dealt with something like this, the owner had 3 different USB cables, none of them helped, he bought another 'data capable' one and it worked. Is it micro-USB?

sudden cape
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yeap micro-usb; The thing is this cable works for my other quads

hollow cave
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OK, if you're confident it's not the cable then that's good enough for me.

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Have you tried flashing it in DFU?

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(I would also suggest - which you may have already done - unplugging all other USB devices etc from any computer you try it on - just in case there's something weird going on there)

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I would also run the driver fixer for the thing when it's in DFU mode too.

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I've had new FCs come to me like this - seemingly non-responsive.

sudden cape
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In DFU is where I get the 'Unknown Usb device' ; I've tried Impulse while in DFU mode too but to no avail.

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Is there anyway to tell if it is in DFU mode, based on the LED on the FC?

hollow cave
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I am thinking that I'd just keep trying with both Zadig and the Impulse RC Driver Fixer - because the system can see it, so the driver fixer should be able to pick it up run with it. I am not aware of any LED lighting combination that might indicate the FC's in DFU mode, doesn't mean there isn't one though.

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(it would likely depend on manufacturer too)

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What happens when you try the Impulse RC Driver?

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Does it just say "cannot find anything"?

sudden cape
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Yea it just gets stuck on the “Looking for FC” screen

hollow cave
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And the Zadig program, have you replaced the USB driver using that etc?

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(making sure you have "options"->"show all devices" selected)

hollow cave
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I must ask too, if the FC is new, or been crashed recently etc etc. I don't want to be trying everything on something that's been crashed and stopped working.

sudden cape
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It’s brand new never seen the skies unfortunately

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I’ll give Zadig another shot

hollow cave
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If you can't get any further we can (if you like) try a call and screen share to see if there's anything obvious (that I might see) that might help. My biggest thing with these issues is the cables, I have a deep distrust the of the USB cables...

sudden cape
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Alright sounds good

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I’ll get back to you after I’ve tried

sudden cape
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oh my god i did it; No Zadig no impulse rc

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All i had to do was unplug my ELRS RX

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I wish you could feel how I feel right now

hollow cave
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Port spamming for the win.