Thank you very very very much for your answer and your help!!! I changed 
uSD file system to EXT4 and after that i tried to write debian os image on 
my uSD with Etcher and it did without error, after that, i plug uSD on BBB 
and i holded down S2 button and plug BBB to lap top with USB cable, after 2 
minute beaglebone drive appeared and the notification "beaglebone getting 
started" was shown!! 

On Saturday, June 29, 2019 at 7:46:32 AM UTC+4:30, Dennis Lee Bieber wrote:
>
> On Fri, 28 Jun 2019 08:08:55 -0700 (PDT), 
> [email protected] <javascript:> declaimed the 
> following: 
>
> >i tried but i'm faild again. i could write any os image for example 
> rasbian 
> >on uSD successfully, but i couldn't write debian for BBB. 
> > 
>
>         Raspbian is a version of Debian customized for the RPi -- and 
> shouldn't 
> work on a BBB. Putting pure Debian on an RPi is tricky, as one needs a 
> custom bootloader https://wiki.debian.org/RaspberryPi  Also -- RPi 
> (Raspbian) images are configured to be /copied/ into a /FAT/ formatted SD 
> card; when booted, they reconfigure the card with a small FAT boot 
> partition and install the rest of the operating system into an EXT4 
> partition they create that uses the rest of the card (I've just updated 
> two 
> SD cards for Raspbian "Buster" [pre-release -- the RPi 4 needs Buster, but 
> Debian hasn't formally released it yet, so it is a "testing" archive]). 
>
>         BBB Debian images do NOT GO ON FAT PARTITIONS. {Very old images 
> DID 
> have a FAT partition, but that is now emulated} Etcher (or other) does a 
> low-level overwrite of the entire card, making it a Linux EXT# format and 
> that format is not understood by Windows... Once Etcher completes, the 
> card 
> will NOT be recognizable by a Windows computer (and may not be recognized 
> by a Linux computer if that computer expects to find a FAT format on SD 
> cards). NOTHING IS WRONG WITH THE CARD AT THIS STAGE UNLESS ETCHER REPORTS 
> AN ERROR. 
>
>         You say "couldn't write debian for BBB" but you never state any 
> exact 
> error message. Did Etcher complete or did IT report a failure. IGNORE any 
> Windows message from trying to open/explore the SD card; once written by 
> Etcher is is not usable by Windows. 
>
>         What does the BBB do after you install the SD card and reboot? 
> What 
> does it do if you hold down the boot select button and /then/ connect the 
> power? What do the BBB LEDs do? 
>
>
>
>
> -- 
>         Wulfraed                 Dennis Lee Bieber         AF6VN 
>         [email protected] <javascript:>    
> http://wlfraed.microdiversity.freeddns.org/ 
>
>

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