ok - I Just tried that, downloaded as a bin file…

Sun Oct 24 09:33:16 UTC 2021 upgrade: Device glinet,gl-mt300n-v2 not supported by this image Sun Oct 24 09:33:16 UTC 2021 upgrade: Supported devices: gl-mt300n-v2 Image check failed.

The uploaded image file does not contain a supported format. Make sure that you choose the generic image format for your platform.

Did I download the wrong file?