Mity CPU Platforms » MitySOM-5CSX Altera Cyclone V

Hello,
I am trying to test bitstream encryption on a MitySOM-5CSx evaluation board and I am running into an issue during boot.
Here is what I have done so far:
In Quartus, I enabled bitstream encryption and generated an encrypted RBF file (dev_5cs.rbf) as well as the corresponding .ekp key file (screenshots attached).
On the evaluation board, I set the battery switch to ON so that VBAT is supplied, as shown in the attached photo.
I copied the encrypted bitstream (dev_5cs.rbf) to the SD card.
I programmed the .ekp file into the FPGA using Quartus Programmer (screenshot attached).
When I boot the system and monitor the console in PuTTY, the boot process stops at “Starting kernel …” and does not proceed further. If I replace the encrypted bitstream with an unencrypted .rbf file, the system boots correctly.
Could you please advise if there is any additional configuration required on the MitySOM-5CSx to support an encrypted RBF, or if there is anything obviously wrong with my setup?
Thank you in advance for your help.
Best regards,