According to the FR24 data I saw, a gradual descent began at 09:51 UTC, from 3250ft and at 09:54, at approx 2225ft the speed dropped rapidly from around 140kts to 64kts within a few seconds.
At this point radar data appears to end.
I'm sorry I don't have more detailed data. This is just from ordinary playback/graph thus may be inaccurate.
Link:
https://www.flightradar24.com/data/a...ln-ojf#98ee4bc