Hello, my pixel 6a bootloader unlocked sucsessfully, but when it comes to download the factory image its very slow downloading and after a little download progress a pop up red message "Error undefined". I dont know how to solve it.

Info:- I am using windows 10 -- android 13

    smexy you aren't using incognito mode, you are using a recommended/supported browser and you are using a fully compliant cable?

      MetropleX I'am using freshly google chrome installed, and and usb is compliant and detected, I unlocked bootloader with same usb. also factory image is downloading but interuppted after 15 Min of loading and showing red message error.

        smexy how much space do you have available on your device and system?

        Also just because the cable can unlock the bootloader doesn't mean it can communicate via fastbootd at low level. Is the cable the one that came with the device? If not many brands cut corners and don't fully comply with the standard.
        Belkin Anker and Aukey are known good cables.

        If that doesn't work using the stock pixel C-C cable try an Android to Android flash if available using another phone with USB C.

        Also be aware that using USB C on a laptop or front IO often doesn't work due to implementation method. Connections should be direct to motherboard on desktop and using A-C on laptops.

          smexy possibly, the USB 2.0 might be a concern. Their series 3 A-C 3.0 cable would be better but if that is what you have available in your locale be worth a try.