Embed recovery, see also MER#1987

[Olf0]

For the a solution, see PR #27.

Now this issue also affects a second "officially supported" device, the Xperia 10 III (in addition to the Xperia 10 II).

Furthermore, as usual with long stalled PRs, the base has been developed further, so PR #27 now need rebasing and this hurdle will continue to be raised over time.

It is a bit sad to see a basically ready PR being stalled for so many years.

P.S.: I also created this issue to be (personally) able to find PR #27 much more easily.