Changing default shell on PogoPro (no replies)

My PogoPro is using

sh

as it's default shell (on the stock Pogo OS). It's not saving a command history, but I'd like it to. I was able to see that

ash

and

hush

shells are also available. When I switch into one, it saves commands only for that SSH session. Is there a way to set

ash

or

hush

to the default, or better yet install and set bash as the default?

Thanks for any advice.