GL A750s upgrade failed

Hi
tried to upgrade an ar-750s as per screenshot here below.
Checksum failed.
I tried both ways: online and local (downloaded form here: https://fw.gl-inet.com/firmware/ar750s/release/openwrt-ar750s-3.212-0407.tar)

Anyone can help me ?
Thanks
D.


You need to download and upgrade 3.105 first. GL.iNet download center

Then from 3.105 you can upgrade to latest firmware.

That is due to major Linux upgrade.