@mrt10001
Thanks for taking the time to respond. I understand this a little clearer now. I will go ahead & try again using the settings recommended. Thanks!

@mrt10001
Thanks for your reply MrT10001. Here's the background:

This will be my 3rd attempt at using the UB installer on my phone. My first two were really bad installs. In fact, after the 2nd I spent a day thinking my phone was bricked until I managed to get it rebooted. I tracked the problem down to a bad USB cable so am going to try again. But I really don't want to kill this phone so I'm trying to make sure I'm following all the steps in the documentation (& everything I can find in the forums) but I'm not seeing anything that says when to use the fastboot option & when not to. Why does the box have a checkmark option if you always leave it checked?

Am I missing something...?

(And thanks for the link to the thread. I've restored it to Android 9.0 & I'll make sure to wipe userdata on the next UT attempt.)

I'm trying to install UT on a Pixel 3a & I don't know if I should leave the "flash system partitions using fastboot" box checked or uncheck it. The bootloader on my phone is unlocked & USB debugging is enabled so I'm hoping I won't have any problems, but I can't find any guidance on when I should check/uncheck the fastboot box. Can anyone help...?