如何在没有快进错误的情况下升级颤振?

Question

我无法升级颤振。每当我下达命令时，

C:srcflutterbin>flutter upgrade

我收到错误

Upgrading Flutter from C:srcflutter...
fatal: Not possible to fast-forward, aborting.

当我给出命令时我没有看到任何错误

flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel beta, v1.17.0-3.2.pre, on Microsoft Windows [Version 10.0.18363.836], locale en-IN)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[√] Android Studio (version 3.6)
[√] VS Code (version 1.45.1)
[!] Connected device
! No devices available
! Doctor found issues in 1 category.

除非未连接任何设备。 请帮忙。

Answer 1

使用命令更改为测试通道：颤振通道测试版 运行颤振升级