6210N downgrade error??

Hi all
ı have minor problem with 6210navigator ı want downgrade for language chance but allways give error all boxes ı tried with eno flash file and full erease with sfi+mxkey+hwk+uni but still same when ı upload same version all thing is good but when ı want enable downgrade allways give cmt boot error ı didn't understut what is wrong? so what can ı do now for solve this problem?

[ı am sorry my bad english ]

Why you to downgrade just flash language only with mxkey. No need for full flash just write language file of SAME ver. it is working fine.

Thanks

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