If your phone is on the “not compatible” list, the Upgrade Advisor will show a red screen. Do not force the upgrade – it will lead to boot loops or a dead radio.
Even with the Upgrade Advisor, not every phone gets the green light. After years of community testing, here’s the official compatibility list (based on Microsoft’s original criteria):
Before you hit "Install," understand the current state of Windows 10 Mobile: windows 10 mobile upgrade advisor app download free
The Windows 10 Mobile Upgrade Advisor was an official Microsoft app designed for Windows Phone 8.1 devices. Its sole purpose was to check if your phone was eligible for the upgrade to Windows 10 Mobile and then guide you through the update process.
It was free to download from the Microsoft Store (formerly Windows Phone Store). If your phone is on the “not compatible”
Note: This section is historical context for archival purposes. The live servers may no longer function.
In its prime (2016–2018), downloading the Upgrade Advisor was a standard trip to the Microsoft Store (formerly the Windows Phone Store). Even with the Upgrade Advisor, not every phone
Microsoft released a desktop tool called the Offline Updater (OTC) . This tool, downloadable for free from Microsoft’s legacy servers, allows you to plug your phone into a Windows PC and force-upgrade it from 8.1 to 10 Mobile without the phone-side app.