  We present Mi{\dh}eind's submission for the English$\to$Icelandic and
Icelandic$\to$English subsets of the 2021 WMT news translation task.
Transformer-base models are trained for translation on parallel data to
generate backtranslations iteratively. A pretrained mBART-25 model is then
adapted for translation using parallel data as well as the last backtranslation
iteration. This adapted pretrained model is then used to re-generate
backtranslations, and the training of the adapted model is continued.
