I tried to install the T dev version of E on the second handy, that would only start up in bootloader mode by wipng the data first with Fastboot -W and then flashing the T dev version of the recovery and voila, that worked as well. I got the same message when sideloading the 1.19.1 -t- 20240112373116-dev-avicii.zip, but rebooting to E os worked as well.
So my advice to everyone who want to install E on a Oneplus Nord: FORGET ABOUT THE STABLE ANDROID S VERSION AND GO STRAIGHT TO THE DEV VERSION ANDROID S.
aibd again thnx a million for all the help and patience
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