Not booting after latest update

[dukla2000]

Hi, 

I issued an

Code:

apt update && apt upgrade

a few hours ago and since then it's not booting anymore. I just see the LED shining in white. The screen remains black.

I saw that it was installing the 5.7 kernel, so I guess it messed up u-boot. 

I had it installed to EMMC, so I hope I will be able to restore everything by booting from SD. Can I just reinstall u-boot? What are the commands to do so?
I'm also still on the old version where /boot was on the root partition. Maybe it is also because of that. I guess, when I'm already in the process of repairing I could also repartition.

ditto! Also on old single partition version. Have backed up my user directory and figure I will start from a new 2 partition download.

1 thing I have noticed - on my trial Mobian/jwm version the screen is flashing like a disco light after the 5.7 upgrade, virtually unusable. Hope the Mobian/phosh version is OK.

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OK, installed 20200625 nightly and it seemed OK. Did the upgrade to 5.7 and after reboot have dark screen - can't find a way to get it legible.

Suspect for now avoid 5.7 kernel?