Hi All!
I have a problem with my SP RACING F4 EVO FC.... and maybe you can help me. 

I want to flash my FC with the lastest BF firm... 3 months ago I flashed in DFU mode without any problems, but now suddenly I cant enter DFU mode.... 

I press the boot button while I put the USB cable. I hear the windows sound and all, but no DFU mode.... only COM1 showing up. Want to say that I always can enter to BF by puting the usb on the FC, I only have problems when try to enter DFU mode.

Had run ZADIG and the ImpulseRC program. It seems that I have the correct driver in STM32 Bootloader device (WINUsb)....I tried again and again and nothing...I also tried to type BL in Cli but the FC hangs.

I am a intermediate pilot and builder and I am an IT professional so I handle well enough with "computer and O.S" things. Never have this problem with the SP F4 before.

I dont understand what the hell is happening.... Does anyone have any clue?

Ty!   

PS: Sorry my English, Greetings from Basque Country.

Long shot, but try typing DFU in your CLI instead of BL

(05-Jun-2018, 03:26 PM)RENOV8R Wrote: Long shot, but try typing DFU in your CLI instead of BL

Ty for the answer.

I will try this... but I think the DFU command was replaced for BL command.

I just read in RCGroups that the SP F4 EVO must be powered before you press the BOOT button.... Dont know, but have to try this too.

I am amazed because 3 months ago I flashed to the last BF firm without any problem. Maybe the Win10 April Update has messed everything related to STM drivers, i will try to install them from scratch.

Ty!

Maybe you boot button just went bad.

BL command should work.

I never heard that the FC needs to be powered before pressing the boot button.

LoL..... Just changed to a 2.0 USB port and problem solved..... 

PLS!! Other persons with this kind of problem, be sure to check other USB ports. (Especially rear ones an 2.0 ones in Desktop rigs).

Ty all who helped.

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(05-Jun-2018, 07:05 PM)voodoo614 Wrote: I never heard that the FC needs to be powered before pressing the boot button.

Yes... I have never heard about it too, but I was desperate....

Yesterday I have the same problem with a matek f405 ctr and the solution for me was closing betaflight betaflight before pressing the FC button and plugging it to the computer.
Not a very difficult problem but I've tried several times before I realized that betaflight was open already....