Hello,
I ruun an Helios4 myself, and I've been struck by the kernel image size issue some time ago. I managed to recover using an old version, but now need to upgrade... I foolishly tried an 'apt update', which obviously end up in a non booting board.
I manage to get it boot with the latest version on SD, but can not manage to make it work from SPI...
Could you please explain how to get the updated u-boot loaded into SPI ? No try using nand-sata-install I've made make a difference.