I think this is the GSI build? This thread is for device specific builds (official and unofficial), but it would be good to put the S21+ on the GSI support page. That table should be editable, so you can directly add your device to that list.
Unofficial builds are now available for two previously unsupported Sony devices, both at Iodé 7: Xperia 1 IVpdx223 and Xperia 5 IVpdx224
Apologies, but I don’t have the patience to edit the table at the top of the thread
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