Hi Guys, sorry for beeing offline so long.
@Telefunky, unfortunately not working.
@dustyslices, im able to run the installer with all versions via usb or osx/windows but after "installation" of any newer than 2.7.2 the device reboots and freezes. Only after installation with 2.7.2 it works again!
the support said, maybe a hardware-part is "stuck" in an older version. But that sounds strange, because once there was a 2.9.0. and only roll back to 2.7.2 recovers.
Dear Ultros, would I be able to install the "inmusic" version again after tryout with "vanilla"?
I hate it, when companies force users to update with always faster/better/stronger features and don't care about bugs..
Happy New Year!
EDIT:
I just checked out the SSH Image. I only found the 12.x on Github. The Installation via usb also failed, like the original one. Do you have still a 2.7.2 "SSH open" version?
My hope, there are tmp folders left I could delete. Of course Ultros, you are the crack, maybe some ideas I could trigger a installation from the internal sd, so the "hardware parts" like the Akai support said are not flying in the air tonight anymore..