Upgrade DEVO 8 problem i need help!

Hi, I have to apologize first for my bad English!
I'm from Germany and have a problem with my DEVO 8 and English too.
Until yesterday, I had the version 2.1.0 on run, then I tried to update the version 2.1.1. But after the update, did that off no longer.
I have the battery (such as in the FAQ to read) changed and tried again.
The same result. Then I installed the original firmware again and everything is back in order.
I then tried to install the version 2.1.0, then again I had the same result, the DEVO will no longer turn off. The LCD is dark, the red LED lights up and you must remove the battery to turn off.
The only thing still work if I put in the battery again, then EXT press and turn on again to get the upgrade mode and I can play again a firmware.
As I said, original firmware works, open source no longer works.
Can someone help me?
Thank you very much!
Greeting
Manfred

Unfortunately no, it is not possible to open the filesystem.
It does nothing more, except the upgrade menu. (holding the EXT button on startup)

sorry, i can not open the USB screen.
if i push the ENT button and turn on the DEVO, the LCD is black.
a new drive is not in Windows shown.

thx, i hope it too,

Which kind of battery do you use?

i have normaly use ENOLOOPS from Sanyo, but i have test (after the problem) with used AA from Philips and new one from Mawxell.
allways the same result. (i have read the FAQ)

Maybe a silly question (when you have read the FAQ you will have done so with the manual): you selected the "upgrade" button in the dfuse-tool (not "upload")? With upload you destroy your dfu-file. In this case download it again from the forum and give it a new try.
It seems as if the dfu-file does not work for your tx. This can happen when
- you selected upload (see above)
- you try to install a version for another tx (6,10,7e)
- the dfu-file is internally corrupt
- the transport of data via USB is somehow disturbed
If you can exclude all of this, PB will be your tx's livesaver...

i check all points again if i am at home, at the moment i am in the office.
sorry for the lag, i write the result today evening.
I think it was due to my stupidity. it can be, i klick on upload, but i am not shure.

on the other hand, back I made to the original firmware really well.
I'm not sure at the moment I am trying it again.
I hope nobody is upset because I'm too stupid.

thanks!

Hello all,

i have download the firmware and Lib. and install it again.
i am so happy ! ! ! it works ! ! !

thank you so much!

regards
Manfred