Failed to open serial port after flashing firmware

[river cairn]

Hi all
I'm new to fpv drones
I bought the happymodel mobula7
Then I was trying to flash firmware using https://www.youtube.com/watch?v=GqLYuEBCHvw&t=335s as a guide

So I downloaded https://www.happymodel.cn/index.php/2022/09/26/crazybeef4sx1280-4-4-0-support-expresslrs-v3-0-beta-version-firmware-download/
Then I tried to flash firmware for mobula7 using usb cable
But looks like it haven't finished and now I can not even connect to mobula 7 using betaflight

When I connect mobula7 to laptop there are only two red lights on the drone and there's no sound anymore, but before there was a sound when I connected it to laptop

If it possible to recover mobula7 somehow? Is there is a chance please help me to do it

Thank you!

[glacial glade]

https://betaflight.com/docs/wiki/guides/current/installing-betaflight

Read through the DFU flashing part. Betaflight doesn't work correctly before you fix the driver as described there.

[urban sage]

https://hackmd.io/@nerdCopter/rJv5TUrQ2

[river cairn]

Thank you for helping
I tried this approach and those programs can not see the mobula7 device and even windows can not see mobula7 anymore

Looks like the mobula7 is broken and can not be recovered
Because I can not find any other approaches how to fix it ☹️

[glacial glade]

As long as it's not physically broken you can recover it. The bootloader is read only and it's all you need to re flash it. Betaflight just got corrupted if the flash failed half way. You just need to hold down the boot button while you plug in the USB and then manually select the correct target and flash with the full chip erase and no reboot sequence ticked. After flashing just unplug and replug. It should be fixed now

[hollow laurel]

What if user is on mac os? Thanks

[glacial glade]

Then Betaflight will just work. Isn't that why people pay 3x for their hardware?

Seriously though. No idea. Never used Betaflight on a Mac. Linux instructions for it probably work, since Mac OS is basically Linux with Apple's special sauce on top

As long as Betaflight Configurator is setup correctly, you can apply any Betaflight recovery tutorial for your purposes.

[river cairn]

Thank you it's helped me!

[glacial glade]

[weak juniper]

What is the most suitable firmware for it in your program?

HAKRC F405 V2

[glacial glade]

Target: HAKRCF405V2 according to 5 seconds of Googling. Just pick whatever is the latest release version of Betaflight and appropriate options for whatever your quad needs

[weak juniper]

@glacial glade
HAKRC 65A F4.
My dear friend, can you help me search and send me the link because I am a beginner and I did not find it?

[glacial glade]

You literally just Google "HAKRC F405 V2 target" and look for a field on a product page or a manual that says "Firmware" or "Target"