The update isn't listed on the german website. Also there is no OTA update aviable in Germany. What happens when I try to install the update which is located at the website you posted?
This is Rollback 5.9.1 EMUI 3.0 for L02
If you have 5.9.16, go back to 5.9.1 with fille Update Extractor
Use Rollback Update.app and after flash B316 or B317.
Then you can flash directly B532
PS - It is possible that works with 9.5.16 but not tested