I bricked my WR21 by attempting to put WR44 firmware on it. Is there a way to recover the WR21?

Digi TransPort WR (Series)
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2

Hi there is a recovery process on the website.

http://ftp1.digi.com/support/utilities/WR21_Step_by_step_test.pdf

you do need a usb b-b cable to carry it out

hope that helps