I use the last apk with my pro 2 :

I wanted to try SHFW today, but I can't install it ("LOAD CUSTOM" button - Install/Update SHFW) :

I use a Galaxy S8 / Android 9.
Is it due to my phone model or my scooter ?
I can flash ZIP3 files without troubles :

Also the builder is empty in the app :

Fortunately I can use the web version at https://mi.cfw.sh/# to generate ZIP3 files.
Thanks and best regards,
dJuL