hey jakiman thanks for the update
maybe stupid question
i can use a chain backup from a newly re-synched 2.1.7 version for masternodes?
Yes, I'm pretty sure you can. This version basically weeds out corrupt blockchains better.

BTW, I"ve updated my guide so that you can just try updating only the binary files first.
ok thanks, i just resynced my ubuntu system with version 2.1.7 from scratch and made a chain backup.
please find it here if you need it:
http://n-tw.net/dnet/chain.tar.gzplease some1 report back here after updating masternodes bin's
with existing chain. will wait with my nodes until we have some feedback here
Cheers and thanks to the whole pivx team once again for all the work.