how can i take flash dreambox DM800 hd se V2 backup (pure2 image) Kernal Dump Error

pure2 image how can i take flash backup (dreambox 800hd se V2)

I have tested many plugins I get them this error

kernel dump error please flash your kernel new and backup again

first I had this error

error miss file backupstick.txt or backupstick

played little now I have it

kernel dump error please flash your kernel new and backup again

tested many different plugins all give different errors

nothing helps if the size of backup is large (over 128mb)

I have tested everything

backup size under 128mb is no problem