The last resort if you can't get your flight controller into DFU mode for flashing...

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[metrahim]

There is known bug that INAV configurator Chrome version can’t flash firmware in DFU mode.

If GPS or other peripherals are connected to UART1 or UART3 of F4/F7/H7 chip and these peripherals are powered ON while connecting USB.   FC can’t enter DFU mode. It is related to DFU protocol used in the STM32 bootloader, not hardware and PC driver issue.

[DFEUERMAN]

UNPLUG GPS!!!! Thanks for doing this video. I have a Darwin129 and I was trying to flash iNav. I had the same head-scratching issues (and tearing hair out, and tears in my eyes and eventually tears of joy.) I even sent you a message at my height of frustration that I couldn't enter DFU and you said it could be a lot of things, which is true. Anyway, "unplug everything" is definitely Step 1!!! Cheers, Painless!

[dgitalchaos]

Glad I found this video! I was pulling my hairs out trying to get this Blitz F7 to 4.5.1. I thought it was a Mac issue, so I downloaded and installed windows 11, and still no luck. Once I disconnect the GPS, my Mac flashed it without issue! Thank you!

[jedituck]

Thanks Lee, just been down virtually the same route as you with a new SpeedyBee 405 wing. Unplugged all and straight into DFU, needed ImpulseRC to allow flashing but now happily on INAV 6.1

[kruphen]

Thanks for making this video, really helpful. I had the same problem trying to upgrade my Rekon 7. I ended up buying a new FC and loading INAV onto it. Wish your video cam out a month earlier (for me), but this will help a lot of people. HGLRC should replace these defective units. For me, I have another spare FC so now I just have to build another quad!

[VadimBryksin]

I have the same problem with iFlight Success-D F7 board, and you know what? I found exactly what was causing it. It is ELRS, by some reason when your FC goes into DFU mode, ELRS also and then you have 2 devices on the same USB port and it doesn't know which device to connect.... Basically now for every FW flash I'm unsoldering red wire from ELRS, what is very annoying.
Ah btw also after I flash the latest 4.4 BF, it asks if I want to play default stuff, if I press yes, FC goes into the brick mode and the only way to rescue it is re-flash with full wipe. Also if I apply for dif from my previous BF 4.3 it also brick FC, so i had to reset everything all my difs and re-setup from zero with this latest BF 4.4

[ShinyVideoStuff]

Had same thing, GPS is spewing serial data so your DFU process uses that UART for DFU instead of the USB port, thinking that the UART is the active connection. Removing power to any peripherals sending serial data prevents this.

[joshmellon]

I just bought this exact FC, and I ended up having to get a replacement because the 9v regulator was no good. I like some HGLRC stuff, but I think they have some room for improvement.

[ArcticriderFPV]

I had the same problem as you! 10 usb cables, one Mac, two PC´s and a speedy bee app later, I had found someone with the same issue as me! Had to unsolder the 5v wires for my GPS and Crossfire, and suddenly it worked! So many hours spent troubleshooting. Oh well, at least I didn't have to buy a new FC. Thanks for sharing it.

[MCsCreations]

What a weird thing to happen, Lee! That's bizarre!
I'm happy you've found a way out!
Anyway, stay safe there with your family! 🖖😊

[dingledisco]

Thanks for the very helpful and informative videos. I've only been in to FPV for a few months but I've learnt a good few things 👍.

[jonstante]

Thanks for this video! It worked for me on my GEPRC Cinelog 20. Nearly identical scenario.

[oloendithas]

Oh. Did you tried to connecting back all the components one by one and testing, which one (or two) exactly was causing the issue?

[TailSpinRCSpain]

On a new build, I always configure the FC out of the box before wiring anything else up, LOL. Thanks for the info Lee.

[jedkenny]

3 days of pure frustration so thank you.
this helped

[sailork]

You are awesome. The absolutely best YTs.

[roger]

good video and info Lee. I have ran into that scenario myself but it always seemed to be with a particular brand of fc board. Very annoying to need to uninstall the board on intermittent times that the computer could not see it. I was never able to get it to work every time but i did narrow it down to unplugging the rx and gps first which usually allowed it to work but if not, then uninstall everything else.

[chuckwain]

I was having the same issue with a SpeedyBee F405 wing. Unplugged the receiver and GPS and was able to get into DFU mode and flash it. I had a thought, perhaps it is power. When I plug in a USB cable both the receiver and GPS light up. Maybe the power available through the USB cable is not enough to power all these devices and the FC. An interesting experiment would be to power the FC with a battery then try the flash process again. I any case thanks for the insight, I was getting pretty frustrated!

[hector-fpv]

This worked like a charm, thanks Lee!!! you saved my flight controller

[jasonstahl]

I've run into that problem when I had just a receiver connected. Disconnected the receiver and I was able to flash it. I usually flash the flight controller before I start the build.