Android downgrade not possible in flashing attempt

[Cee47]

I have a 3a and am trying to install UT. I have the .002 factory image as described. OEM unlocking and ADB is enabled. The bootloader is unlocked and shows on the screen as unlocked ("Device state: unlocked"). ADB Devices shows my phone. I use the ADB sideload command in an Ubuntu terminal using the filename recommended. I am trying to downgrade the Android version as described. The percentage of completion ticks eventually to 100% then I get an error:

E: Update package is older than the current build, expected a build newer than timestamp 1636136601 but package has timestamp 1560995145 and downgrade not allowed.

Did I miss a step?

[MrT10001]

Have you tried downgrading using Google browser and the android flash tool. Check the other posts in the Pixel 3a forum about it. It can make life a bit easier.

[Cee47]

Your suggestion worked. There were no problems. I installed UT just fine and my install worked better with an ethernet connection. Thanks very much for the reply.

[Lakotaubp]

@cee47 Please mark as solved it will help others https://forums.ubports.com/topic/6311/how-to-ask-a-question-and-then-mark-it-as-solved/1