New kernel for Nanopi R5S makes SD-card not bootable - SOLVED

[Cabletwister]

Creating a bug report/issue

• [X] I have searched the existing open and closed issues

Required Information

• DietPi version | 9.7.1 master MichaIng
• Distro version | bullseye
• Kernel version | Linux DietPi 5.10.110 #1 SMP Sat Dec 3 CST 2022 aarch64 GNU/Linux
• SBC model | NanoPi R5S/R5C (aarch64) (mine is an R5S)
• Power supply used | big
• SD card used | Sandisk

Additional Information (if applicable)

• Software title | (EG: Nextcloud)
• Was the software title installed freshly or updated/migrated?
• Can this issue be replicated on a fresh installation of DietPi? YES - when pulling the latest bookworm image from https://dietpi.com/downloads/images/DietPi_NanoPiR5S-ARMv8-Bookworm.img.xz and flash it to SD, this SD card will not start.

Steps to reproduce

• Use an existing DietPi installation that is successfully starting from SD Card
• Do the update and switch to the new kernel
• Reboot

Expected behaviour

DietPi with new kernel is starting from SD card

Actual behaviour

SD Card is not discovered as bootable, NanoPi starts from MMC or any other system, cannot use SD

Extra details

I have first experienced this when updating a DietPi installation that was some 3-4 months old. As the youngest working DietPi image I had on my machine was March 2023 I had to use this one. I installed it to several SD cards and did an install & update. => Whenever I went for the new R5S kernel, I was unable to start from SD afterwards => Whenever I kept the old version (selected "Cancel" when asked to switch to new kernel) it works like a charm, boots from SD => Whenever I download the latest image and flash to card, it will not start from SD