Cannot dump beelink R89 Stock ROM

[spon901]

I tried to dump the stock ROM of Beelink R89 using AndroidTool V2.3
First I extract the parameter file using start = 0 and count = 2 and then start to extract the other parts according to the parameter file. However kernel seems to be empty, and boot contains the parameter file from time to time . Only system seem to contain something, but have no idea if it is correct what is inside. Is there any other way to make this dump? Or it there any kind of protection?

I intend to put wasser lolipop on it, but want to be able to came back if possible.

[FunThomas]

maybe you can install TWRP for beelink ?

http://crewrktablets.arctablet.com/?p=4776

and make a backup in the recovery and then restore the recovery and the backup after this

[spon901]

I tried to install TWRP, however besides the fact that the process of writing the firmware was ok, the system did not boot anymore. So finally I put the lolipop firmware without to take any backup.