Unable to upgrade BH 2.0.4 to BH 2.1.4 on Vu Duo

Try formatting your usb using the hp format usb tool attached.
Disconnect all usb devices and also your hdd (if installed) and try to reflash.

And as you have flashed previously then you know how the folder should be in your usb stick...
1 folder named vuplus containing 4/5 files inside..

You most update bootloader first

Quote from horn

This was done before . You cannot upgrade to BH 2.0.4 prior to install this file what you mentioned.
But I made experiment even installing again bootloader - no joy

sorry mate no disrespect but are you sure your box is not clone , maybe thats why ur able to return to a BH
2.0.4.

Do you have a backup saved on the hdd ?

download a new copy of BH 2.1.4 try again, remember a swap file is recommended to use with this image when you get it working, it night be no harm to factory reset box before flash,you could also try flash via rs232 method

I read that 2.1.4 for vu duo includes its own system swapfile

been using it for a few weeks, d/l from home site and they recommend you set up swap, either way you still have to mount usb, and 4 or 5 clicks sets it up , I'd say the zram compression function is what you mean, explained here, taken from another forum

Solo and Duo only:
The 1920x1080 framebuffer support has required extra Ram usage. For this reason the old Solo and Duo models do not have enough free ram to run the curent images with these new features.
In Black Hole 2.1.4 we have included ram compression (zram) that increases performance by avoiding paging to disk and using a compressed block device in RAM instead, inside which the paging takes place until it is necessary to use the swap space on a hard drive or usb stick. Since using ZRAM is an alternative way to provide swapping on RAM, zram allows Linux to make more use of RAM when swapping/paging is required.

Quote from horn

If so, should I remove swap file , before upgrade ?

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It's 100% original

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Yes, I have done backup before flashing new image.This backup is Personal one

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Remove all backups from usb sticks and hdd's (just copy them to your desktop then delete them from the box).

Then try and update it again

The new reflash will clean just about everything previously on the flash..
so no need to do anything but flash the new image ..
another thing :

Quote

there are 3 files with extension of his 75.6 MB.

Is this correct?? I don´t have a DUO but usually clean Vu+ images are 4 or 5 files within the vuplus folder..
I would try another source to download the image from...

http://workupload.com/file/ub2bja4n

the op is correct, I always use BH, always from the original forum, currently using the version he's trying to flash, & inside the duo folder there are 3 files

You can try from original source :

[URL='www.vuplus-community.net/board/attachments/blackhole-2-1-4-bm750_usb-zip.17073/']DUO BH 2.1.4[/URL]

sometimes these boxes are picky with usb sticks, try a smaller stick,4gb, as mentioned earlier you always have rs232 option