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LEAP 15.1 Dual boot with Win 10 failed after conversion to UEFI

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G'day all,

I am the happy owner of a Dell Latitude E6530 (from 2012). Back in those days, it sported a 550 GB HDD and came with Windoze 7 Pro pre-installed. To remain happy, I installed openSUSE in dual boot.
In those days, it was set up with (legacy) BIOS.
Late last year I received a 500GB SSD, so I swapped the HDD. OpenSuse has in the meantime been updated to Leap 15.0 and Windoze to Ver. 10 Pro. All through clean installs and without significant problems.
Starting all over with a blank SSD, I decided to convert the thing to GPT as advised by a number of experts. I also disabled the use of legacy boot options in the hardware set-up.
Installation of Wind 10 went without a glitch, so I thought:"Cool! Let's do Leap 15.1". And then the "fun"started.
I conscientiously followed the installation instructions. The boot screen as displayed during the installation process showed command line and edit options but no function keys, so, UEFI was definitely recognised by the installer as the designated boot mode. I decided to go for 3 partitions: a "/" partition of 60 GB, a "/swap" partition of 8 GB and a "/home" partition of 40 GB.

In the Installation Settings screen, I changed the default location from MBR to the partition with "/boot". (Which happens to be the ESP, I guess.)

When starting up, Windows started up as usual, but openSUSE could only start with legacy boot mode enabled. What did I do wrong?

A second thing is that, when the laptop freshly arrived with only Windoze installed, the boot mode was set as "openSUSE SecureBoot". After conversion to GPT, this feature was lost.
Is there a possibility to download and re-install this?

Thank you in advance for reading this and all suggestions you may have.


In the meantime, stay healthy and have a nice day.

Regards,

Rob

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