
Getting below error when opening BC in Explorer
"something went wrong. An error has occurred Date and time: XXXXXXXX: GMT" after Business central 17 update, the time shown is 3 hours head of the server time
Within this context there are not that much info of what you did.
Best suggestion is to restart everything from scratch and follow EXACTLY what is written here
docs.microsoft.com/.../upgrade-unmodified-application-v16-to-v17
If you cannot make it this second time, please open a request to Microsoft support through your CSP or reseller or hire a skilled 3rd party freelance to troubleshoot your upgrade path and dig deeper in every step.