Andoird 7.0 update killed my phone.

hi all
looking for your help.
Holder of Samsung A3 2017 I had the VERY bad idea to install android 7.0 on Sunday.
Since then I cannot litterally use my phone normally.
All the google suits apps are not working+all the apps relying on them (for instance apps using gmap).
Attached some screenshots.
I have wiped apps cache and system cache, still the same.
Thank you

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