Well it seems I will need a windows pc to revert to STOCK ROM as described here:
https://doc.e.foundation/pages/revert_oneplus_to_stock_on_windows.html
After that I can try to manually instal /e/ on my avicii OnePlus phone.
I’m however clueless (easy installer user up until now) as to which ROM to install.
Android S / R / Q? My GS290 runs 1.17-S (installed via Easy Installer)
Then there are “recovery” versions.
https://images.ecloud.global/stable/avicii/
Do I download MD5 / SHA356 / Recovery and boot img.???
I’m lost