How to change language on a non wifi connected Roomba ?

Allan

New Member
Hi,
 
I have an old robovac which has run the course for its utility. I was looking for a new one and came across irobot roomba 665 on this blog. That page also lists more options to choose from with lots of detailing. While everything looks fine, I want to know if there's any I can change the language on a non wifi connected Roomba ? Any one's having any ideas ?
 
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