cannot move geli disk from 6.3-R to 6.1-R

[Dmitry Sukhodoyev]

i try to attach geli provider, which i have used in 6.3-RELEASE to 
6.1-RELEASE:

# geli attach -k /root/da1.key /dev/da1
MD5 hash mismatch for /dev/da1

in 6.3-R it still attaches successfully, but in 6.1-R is not. system 
with 6.1-R is not my own, so i can't update it. how i can attach geli 
provider from my 6.3-R to this 6.1-R?

-- 
raVen