OnePlus 8T on e/OS latest A14. I want to upgrade to A15. I do not care about loss of all data. What to do?
Process are the same, only difference is erasing the /data partition or not (factoty-reset or not).
[HOWTO] upgrade my /e/OS to major android version
To upgrade to e-a15, you must look if needed firmware parts are present into the /e/OS build,
if yes, you can install /e/OS directly.
if not, you must install stockOS a15 (if exist) or latest available prior to /e/OS