hello I need help yyyyyyyyyy problem 0.8a

I decided to upgrade my devo 10 to 5.0.0 software I did it every thing whent good but I didn't like the software then I decidet to get back to 0.8a software before doing that I went it the devo 10 deleted all the usb files in the devo 10 and then hit ext and on botton and uploadet the 0.8a software but when I did it it some yyyyyyyyyy's showed up in the menu all over and it just didn't work then I tryed to upload the 5.0.0 software but this time I could not enter the devo 10 beacuse a white screan showed up whit nothing on it insted a usb icon on the screan how can I get it back to 0.8a whit out alll the yyyyyyyyyyyy's in the menu and how can I get back the usb thing on insted a whitescrean

I did update the library and its still like that :/

its possible let me try

yes it worked ty a lot

and how do I fix the white screan when I am whit the 5.0.0 software like when I upgrade it and just a white screan pops up and I cant enter the devo thew my usb

nvm I fixed it the same way
just got a fresh file ty a lot