It seems that you have walked through all the troubleshooting steps to update the mobile app. I recommend reaching out to your school to allow the IT Department or Admin to look into the mobile app further. If further assistance is needed, the district's Admin can reach out to PowerSchool SIS Support.
Jamie M. PowerSchool Community Moderator Remember to give Kudos to suggestions that help you! If another user helps solve your issue, please select Accept As Solution on their post so others can see the solution, too!