I have a Sony Xperia 10 Plus L4293 model and I have not been able to install Ubuntu Touch on my device. First issue is since I have unlocked the boot loader it appears emma will not present any roms for me to install on the phone.

2nd to that I appear to be having issues flashing 3rd party roms to the phone as well from sites like https://xperiastockrom.com/ and others.

Is there any way to forgo the Android 9 stock install and complete partitioning manually? I thought I read somewhere you need the stock rom in order to setup the proper phone partitions.

Thanks